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If n≥2 is a positive integer, then the sum of the series n+1C2+2(2C2+3C2+4C2+⋯+nC2) is |
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Answer» If n≥2 is a positive integer, then the sum of the series n+1C2+2(2C2+3C2+4C2+⋯+nC2) is |
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