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Answers and rating deltas for

How to get the n if I know the result of 1+2+3+..+n=n*(n+1)/2?

Author Votes Δ
Grzegorz Górkiewicz 3 +1.46
skypjack 3 +0.69
Sandipan Dey 0 -0.88
Last visited: Jun 24, 2017, 4:03:14 PM