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Two fours (or fewer?) (Posted on 2006-04-07) Difficulty: 3 of 5
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?

See The Solution Submitted by Jer    
Rating: 4.0000 (2 votes)

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Solution Solution to first part | Comment 1 of 16

One answer is 4SQRT(!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

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