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Prove 1.2 + 2.3 + 3.4 + ⋯ + n(n+1)=[n(n+1)(n+2)3]. |
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Answer» Prove 1.2 + 2.3 + 3.4 + ⋯ + n(n+1)=[n(n+1)(n+2)3]. |
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