Question: Prove that for every positive integer n, 1x2x3 + 2x3x4 + ...+ n(n + 1)(n+2) = n(n + 1)(n + 2)(n +3)/4

Prove that for every positive integer n, 1x2x3 + 2x3x4 + ...+ n(n + 1)(n+2) = n(n + 1)(n + 2)(n +3)/4

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