Saturday 6 September 2014

mathematics - Make 6 5 4 3 = 81


Can you find a way to make:



6 5 4 3 = 81



by concatenation and/or adding any of (and only) these mathematical operators:



  • +

  • -


  • ×

  • !

  • ÷

  • ^

  • standard parentheses ()


You cannot add other numbers to the equation, or re-order the existing numbers.
The result must be a mathematical equality.


Harder version...


Try to do it while only altering the left hand side!





Inspired by Make 5 5 5 5 = 19


Hopefully somewhat more challenging than my previous attempt (may be hard not to be!)



Answer



I thought a bit too much but I finally got it:



$\frac{6+5!*4}{3!}=81$



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