There is a way to express 64 with only two fours and no symbols beyond +, -, *, /, ^, √, !, and parenthesis, although some may be used more than once. It isn't too hard. Can you find it?

It is asserted in a reliable source that 64 can also be expressed with a single 4 using 57 square root signs, nine factorials (no double or higher factorials), and 18 sets of parentheses. I can't figure it out. Can you?

One answer is 4^SQRT(!4) = 64

The subfactorial of 4 is 9...the square root of 9 is 3....4 to the 3rd power is 64.

Edited on April 7, 2006, 4:12 pm

Posted by Dej Mar on 2006-04-07 15:27:38