Without using addition, make five 6s to equal 30.
Without using addition, make six 7s to equal 42.

The calculations should be exact (no rounding functions). Any common symbols or operators other than addition are allowed.

Replacing addition with subtracting a negative is NOT a solution.

30
= (6 * 6) - (6 * (6/6))
= 6 * (6 - (6/6)⁶)


42
= 7 * ((7 - 7/7) * (7/7))
= 7 * 7 - (7 * (7/7)⁷)

=7! / (7 - 7/7 - 7/7)!

Edited on December 15, 2009, 8:45 am

Posted by Dej Mar on 2009-12-14 17:22:21