Mathematics
Mathematics, 27.11.2020 23:50, ella3714

By mathematical induction 1.2²+2.3²++n(n+1)1=n(n+1)(n+2)(3n+5 )/12

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By mathematical induction 1.2²+2.3²++n(n+1)1=n(n+1)(n+2)(3n+5 )/12...

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