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- 05:42, 4 March 2010 (diff | hist) . . (+629) . . N KGS math club/solution 9 1 (Created page with 'Proof by contradiction. Let S_1 = 9, S_2 = 99, etc. Consider the first N values of the set. Since none of this (assumed) is divisible by N, they are all != 0 modulo N. Hence, …') (current)
