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0 votes
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in Arithmetic Progression by (43.3k points)

12 + 1 + 22 + 2 + 32 + 3 + 42 + 4 + …………………… + n2 + n =

A) \(\cfrac{n(n+1)(n+2)}3\)

B) \(\cfrac{n(n+1)}2\)

C) \(\cfrac{n(n+1)(n+2)(n+3)}4\)

D) \([\cfrac{n(n+1)}2]^2\)

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1 Answer

+1 vote
by (43.0k points)

Correct option is A) \(\cfrac{n(n+1)(n+2)}3\)

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