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1.2.3 + 2.3.4 +…+ n(n+1) (n+2) = n(n + 1)(n + 2)(n + 3)/4

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Solution for 1.2.3 + 2.3.4 +…+ n(n+1) (n+2) = n(n + 1)(n + 2)(n + 3)/4

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