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.

POSSIBLE SOLUTIONS: ==so far

WITH **FIVE** DIGITS :

30=6/6 * (6*6-6) or 6*(66/6-6)

and

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

WITH **six** DIGITS :

30=(sqrt(6*6)) /6 * (6*6-6) or 6!/(6-6/6-6/6)!

and

42=(sqrt(7*7) /7) *( 7*7-7) or 7!/(7-7/7-7/7)!

WITH **fou**r DIGITS :

30=6* (6-6/6)

42=7*(7-7/7)

WITH **three **DIGITS :

30= 6*6-6

42=7*7-7

there are probably more ....

*Ed*

*Edited on ***December 14, 2009, 2:01 pm**