`1.3+2.4+3.5+....+n(n+2)=(n(n+1)(2n+7))/6`

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`1.3+2.4+3.5+....+n(n+2)=(n(n+1)(2n+7))/6` 0:02:29

`1.3+2.4+3.5+....+n(n+2)=(n(n+1)(2n+7))/6`

probar que 1.3+2.4+3.5+...+n(n+2)=n(n+1)(2n+7)/6 0:06:55

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