
Lite 
4+4+4+4=2!
Category:  Math 
Submitted By:  javaguru 
Fun:  (2.42) 
Difficulty:  (3.05) 
In "4+4+4+4=1!" it was shown that just using addition, subtraction, multiplication, and division, you can form all the numbers from 0 to 9 using exactly four 4's.
For example: 7 = 4 + 4  4/4
Now if you add the operations square root, factorial, and exponent, what is the first number counting up from zero that can't be formed? How can each number be formed?
You may use parentheses, but you may not combine fours to make 44 or 444.
(An exponent is raising a number to the power of another number such as 4^4 = 256; a factorial is the product of all the integers from 1 to the integer such as 4! = 1x2x3x4 = 24.)
Comments on this teaser
Most Popular  Hardest  Easiest
Privacy  Terms
Copyright © 2003