Question: Prove that 1+2 + 1 +6 + 1 + n(n+1) = n+n+1

Prove that 1+2 + 1 +6 + 1 + n(n+1) = n+n+1

Prove that 1+2 + 1 +6 + 1 + n(n+1) = n+n+1

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