Use 0, 5, 7 and 1 to make 89

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Assemble a formula using the numbers $5$, $0$, $1$, and $7$ in any order to make 89. You may use the operations $x + y$, $x - y$, $x times y$, $x div y$, $x!$, $sqrtx$, $sqrt[leftroot-2uproot2x]y$ and $x^y$, as long as all operands are either $7$, $0$, $1$, or $5$. Operands may of course also be derived from calculations e.g. $10+(7*5)$. You may also use brackets to clarify order of operations, and you may concatenate two or more of the four digits you start with (such as $7$ and $5$ to make the number $75$) if you wish. You may only use each of the starting digits once and you must use all four of them. I'm afraid that concatenation of numbers from calculations is not permitted, but answers with concatenations which get $89$ will get plus one from me.



Double, triple, etc. factorials (n-druple-factorials), such as $5!! = 5 times 3 times 1$ are not allowed, but factorials of factorials are fine, such as $((5-1)!)! = 24!$. I will upvote answers with double, triple and n-druple-factorials which get $89$, but will not mark them as correct.






mathematics formation-of-numbers







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  • 1




    Just to be clear: it isn't valid to make 68 and then rotate the number, right?
    – Racso
    2 hours ago










  • @Racso - I love a solution like that and would upvote the answer if you post it, but I'm afraid that it is not the solution
    – tom
    2 hours ago














up vote
1
down vote

favorite












Assemble a formula using the numbers $5$, $0$, $1$, and $7$ in any order to make 89. You may use the operations $x + y$, $x - y$, $x times y$, $x div y$, $x!$, $sqrtx$, $sqrt[leftroot-2uproot2x]y$ and $x^y$, as long as all operands are either $7$, $0$, $1$, or $5$. Operands may of course also be derived from calculations e.g. $10+(7*5)$. You may also use brackets to clarify order of operations, and you may concatenate two or more of the four digits you start with (such as $7$ and $5$ to make the number $75$) if you wish. You may only use each of the starting digits once and you must use all four of them. I'm afraid that concatenation of numbers from calculations is not permitted, but answers with concatenations which get $89$ will get plus one from me.



Double, triple, etc. factorials (n-druple-factorials), such as $5!! = 5 times 3 times 1$ are not allowed, but factorials of factorials are fine, such as $((5-1)!)! = 24!$. I will upvote answers with double, triple and n-druple-factorials which get $89$, but will not mark them as correct.






mathematics formation-of-numbers







share|improve this question

















  • 1




    Just to be clear: it isn't valid to make 68 and then rotate the number, right?
    – Racso
    2 hours ago










  • @Racso - I love a solution like that and would upvote the answer if you post it, but I'm afraid that it is not the solution
    – tom
    2 hours ago












up vote
1
down vote

favorite









up vote
1
down vote

favorite











Assemble a formula using the numbers $5$, $0$, $1$, and $7$ in any order to make 89. You may use the operations $x + y$, $x - y$, $x times y$, $x div y$, $x!$, $sqrtx$, $sqrt[leftroot-2uproot2x]y$ and $x^y$, as long as all operands are either $7$, $0$, $1$, or $5$. Operands may of course also be derived from calculations e.g. $10+(7*5)$. You may also use brackets to clarify order of operations, and you may concatenate two or more of the four digits you start with (such as $7$ and $5$ to make the number $75$) if you wish. You may only use each of the starting digits once and you must use all four of them. I'm afraid that concatenation of numbers from calculations is not permitted, but answers with concatenations which get $89$ will get plus one from me.



Double, triple, etc. factorials (n-druple-factorials), such as $5!! = 5 times 3 times 1$ are not allowed, but factorials of factorials are fine, such as $((5-1)!)! = 24!$. I will upvote answers with double, triple and n-druple-factorials which get $89$, but will not mark them as correct.






mathematics formation-of-numbers







share|improve this question













Assemble a formula using the numbers $5$, $0$, $1$, and $7$ in any order to make 89. You may use the operations $x + y$, $x - y$, $x times y$, $x div y$, $x!$, $sqrtx$, $sqrt[leftroot-2uproot2x]y$ and $x^y$, as long as all operands are either $7$, $0$, $1$, or $5$. Operands may of course also be derived from calculations e.g. $10+(7*5)$. You may also use brackets to clarify order of operations, and you may concatenate two or more of the four digits you start with (such as $7$ and $5$ to make the number $75$) if you wish. You may only use each of the starting digits once and you must use all four of them. I'm afraid that concatenation of numbers from calculations is not permitted, but answers with concatenations which get $89$ will get plus one from me.



Double, triple, etc. factorials (n-druple-factorials), such as $5!! = 5 times 3 times 1$ are not allowed, but factorials of factorials are fine, such as $((5-1)!)! = 24!$. I will upvote answers with double, triple and n-druple-factorials which get $89$, but will not mark them as correct.






mathematics formation-of-numbers




mathematics formation-of-numbers






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked 5 hours ago









tom

1,8011325




1,8011325







  • 1




    Just to be clear: it isn't valid to make 68 and then rotate the number, right?
    – Racso
    2 hours ago










  • @Racso - I love a solution like that and would upvote the answer if you post it, but I'm afraid that it is not the solution
    – tom
    2 hours ago












  • 1




    Just to be clear: it isn't valid to make 68 and then rotate the number, right?
    – Racso
    2 hours ago










  • @Racso - I love a solution like that and would upvote the answer if you post it, but I'm afraid that it is not the solution
    – tom
    2 hours ago







1




1




Just to be clear: it isn't valid to make 68 and then rotate the number, right?
– Racso
2 hours ago




Just to be clear: it isn't valid to make 68 and then rotate the number, right?
– Racso
2 hours ago












@Racso - I love a solution like that and would upvote the answer if you post it, but I'm afraid that it is not the solution
– tom
2 hours ago




@Racso - I love a solution like that and would upvote the answer if you post it, but I'm afraid that it is not the solution
– tom
2 hours ago










4 Answers
4






active

oldest

votes

















up vote
2
down vote













Using double factorial, but no concatenation:




$5!!times(7-1)-0!$







share|improve this answer




















  • nice double factorial answer -- plus one
    – tom
    3 hours ago

















up vote
1
down vote













An answer using double factorials:




$7!!-15-0!=89$




I'll try to get the real answer too.






share|improve this answer




















  • Nice answer with double factorials .. plus one...
    – tom
    4 hours ago

















up vote
1
down vote













I believe




$71- (sqrt5-0!) $




is 69.



Yay.



FUN ANSWER
"Rearranging the digits"



EDIT



Oops, I misread it. I'll keep working on it.
5! is only 31 more than 89. The answer is tantalizingly close.



Hey, can we use any of the round, floor, ceiling, or truncate functions?






share|improve this answer






















  • Where is the zero? Don't forget to include 0!.
    – Brendon Shaw
    4 hours ago










  • The answer is supposed to be 89. This makes 69.
    – Weather Vane
    4 hours ago











  • oops, i fixed it.
    – Alto
    4 hours ago






  • 1




    I am sorry, I am too naive to understand why a wrong answer gets upvotes. It should be a fun comment.
    – Weather Vane
    4 hours ago











  • @tom So is this correct?
    – PotatoLatte
    1 hour ago

















up vote
0
down vote













My best try




$10^2 - 7 - 5 = 88 $






share








New contributor




Chief VOLDEMORT is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

















  • Square isn’t a valid operator.
    – Quintec
    5 mins ago










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4 Answers
4






active

oldest

votes








4 Answers
4






active

oldest

votes









active

oldest

votes






active

oldest

votes








up vote
2
down vote













Using double factorial, but no concatenation:




$5!!times(7-1)-0!$







share|improve this answer




















  • nice double factorial answer -- plus one
    – tom
    3 hours ago














up vote
2
down vote













Using double factorial, but no concatenation:




$5!!times(7-1)-0!$







share|improve this answer




















  • nice double factorial answer -- plus one
    – tom
    3 hours ago












up vote
2
down vote










up vote
2
down vote









Using double factorial, but no concatenation:




$5!!times(7-1)-0!$







share|improve this answer












Using double factorial, but no concatenation:




$5!!times(7-1)-0!$








share|improve this answer












share|improve this answer



share|improve this answer










answered 3 hours ago









elias

7,80232151




7,80232151











  • nice double factorial answer -- plus one
    – tom
    3 hours ago
















  • nice double factorial answer -- plus one
    – tom
    3 hours ago















nice double factorial answer -- plus one
– tom
3 hours ago




nice double factorial answer -- plus one
– tom
3 hours ago










up vote
1
down vote













An answer using double factorials:




$7!!-15-0!=89$




I'll try to get the real answer too.






share|improve this answer




















  • Nice answer with double factorials .. plus one...
    – tom
    4 hours ago














up vote
1
down vote













An answer using double factorials:




$7!!-15-0!=89$




I'll try to get the real answer too.






share|improve this answer




















  • Nice answer with double factorials .. plus one...
    – tom
    4 hours ago












up vote
1
down vote










up vote
1
down vote









An answer using double factorials:




$7!!-15-0!=89$




I'll try to get the real answer too.






share|improve this answer












An answer using double factorials:




$7!!-15-0!=89$




I'll try to get the real answer too.







share|improve this answer












share|improve this answer



share|improve this answer










answered 4 hours ago









Brendon Shaw

1689




1689











  • Nice answer with double factorials .. plus one...
    – tom
    4 hours ago
















  • Nice answer with double factorials .. plus one...
    – tom
    4 hours ago















Nice answer with double factorials .. plus one...
– tom
4 hours ago




Nice answer with double factorials .. plus one...
– tom
4 hours ago










up vote
1
down vote













I believe




$71- (sqrt5-0!) $




is 69.



Yay.



FUN ANSWER
"Rearranging the digits"



EDIT



Oops, I misread it. I'll keep working on it.
5! is only 31 more than 89. The answer is tantalizingly close.



Hey, can we use any of the round, floor, ceiling, or truncate functions?






share|improve this answer






















  • Where is the zero? Don't forget to include 0!.
    – Brendon Shaw
    4 hours ago










  • The answer is supposed to be 89. This makes 69.
    – Weather Vane
    4 hours ago











  • oops, i fixed it.
    – Alto
    4 hours ago






  • 1




    I am sorry, I am too naive to understand why a wrong answer gets upvotes. It should be a fun comment.
    – Weather Vane
    4 hours ago











  • @tom So is this correct?
    – PotatoLatte
    1 hour ago














up vote
1
down vote













I believe




$71- (sqrt5-0!) $




is 69.



Yay.



FUN ANSWER
"Rearranging the digits"



EDIT



Oops, I misread it. I'll keep working on it.
5! is only 31 more than 89. The answer is tantalizingly close.



Hey, can we use any of the round, floor, ceiling, or truncate functions?






share|improve this answer






















  • Where is the zero? Don't forget to include 0!.
    – Brendon Shaw
    4 hours ago










  • The answer is supposed to be 89. This makes 69.
    – Weather Vane
    4 hours ago











  • oops, i fixed it.
    – Alto
    4 hours ago






  • 1




    I am sorry, I am too naive to understand why a wrong answer gets upvotes. It should be a fun comment.
    – Weather Vane
    4 hours ago











  • @tom So is this correct?
    – PotatoLatte
    1 hour ago












up vote
1
down vote










up vote
1
down vote









I believe




$71- (sqrt5-0!) $




is 69.



Yay.



FUN ANSWER
"Rearranging the digits"



EDIT



Oops, I misread it. I'll keep working on it.
5! is only 31 more than 89. The answer is tantalizingly close.



Hey, can we use any of the round, floor, ceiling, or truncate functions?






share|improve this answer














I believe




$71- (sqrt5-0!) $




is 69.



Yay.



FUN ANSWER
"Rearranging the digits"



EDIT



Oops, I misread it. I'll keep working on it.
5! is only 31 more than 89. The answer is tantalizingly close.



Hey, can we use any of the round, floor, ceiling, or truncate functions?







share|improve this answer














share|improve this answer



share|improve this answer








edited 4 hours ago

























answered 4 hours ago









Alto

1,008117




1,008117











  • Where is the zero? Don't forget to include 0!.
    – Brendon Shaw
    4 hours ago










  • The answer is supposed to be 89. This makes 69.
    – Weather Vane
    4 hours ago











  • oops, i fixed it.
    – Alto
    4 hours ago






  • 1




    I am sorry, I am too naive to understand why a wrong answer gets upvotes. It should be a fun comment.
    – Weather Vane
    4 hours ago











  • @tom So is this correct?
    – PotatoLatte
    1 hour ago
















  • Where is the zero? Don't forget to include 0!.
    – Brendon Shaw
    4 hours ago










  • The answer is supposed to be 89. This makes 69.
    – Weather Vane
    4 hours ago











  • oops, i fixed it.
    – Alto
    4 hours ago






  • 1




    I am sorry, I am too naive to understand why a wrong answer gets upvotes. It should be a fun comment.
    – Weather Vane
    4 hours ago











  • @tom So is this correct?
    – PotatoLatte
    1 hour ago















Where is the zero? Don't forget to include 0!.
– Brendon Shaw
4 hours ago




Where is the zero? Don't forget to include 0!.
– Brendon Shaw
4 hours ago












The answer is supposed to be 89. This makes 69.
– Weather Vane
4 hours ago





The answer is supposed to be 89. This makes 69.
– Weather Vane
4 hours ago













oops, i fixed it.
– Alto
4 hours ago




oops, i fixed it.
– Alto
4 hours ago




1




1




I am sorry, I am too naive to understand why a wrong answer gets upvotes. It should be a fun comment.
– Weather Vane
4 hours ago





I am sorry, I am too naive to understand why a wrong answer gets upvotes. It should be a fun comment.
– Weather Vane
4 hours ago













@tom So is this correct?
– PotatoLatte
1 hour ago




@tom So is this correct?
– PotatoLatte
1 hour ago










up vote
0
down vote













My best try




$10^2 - 7 - 5 = 88 $






share








New contributor




Chief VOLDEMORT is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

















  • Square isn’t a valid operator.
    – Quintec
    5 mins ago














up vote
0
down vote













My best try




$10^2 - 7 - 5 = 88 $






share








New contributor




Chief VOLDEMORT is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

















  • Square isn’t a valid operator.
    – Quintec
    5 mins ago












up vote
0
down vote










up vote
0
down vote









My best try




$10^2 - 7 - 5 = 88 $






share








New contributor




Chief VOLDEMORT is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.









My best try




$10^2 - 7 - 5 = 88 $







share








New contributor




Chief VOLDEMORT is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.








share


share






New contributor




Chief VOLDEMORT is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.









answered 7 mins ago









Chief VOLDEMORT

1




1




New contributor




Chief VOLDEMORT is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.





New contributor





Chief VOLDEMORT is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.






Chief VOLDEMORT is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.











  • Square isn’t a valid operator.
    – Quintec
    5 mins ago
















  • Square isn’t a valid operator.
    – Quintec
    5 mins ago















Square isn’t a valid operator.
– Quintec
5 mins ago




Square isn’t a valid operator.
– Quintec
5 mins ago

















 

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