Mathematics, 17.11.2020 14:00 lashaunahard

Show that (1×3)+(2×4)+(3×5)+...n(n+2)=[n(n+1) (2n+7)]/6 for n $\geqslant$
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Show that (1×3)+(2×4)+(3×5)+...n(n+2)=[n(n+1) (2n+7)]/6 for n 1

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Show that (1×3)+(2×4)+(3×5)+...n(n+2)=[n(n+1) (2n+7)]/6 for n $\geqslant$
1