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1^{2} . 2 + 2^{2} . 3 + 3^{2} . 4 +

--------ধারার n পদের যোগফল কত ?

\frac{1}{2} n (n + 1) (n + 2) (3 n + 1)

n^{3} + 2 n^{2}

n (n + 1)

n^{3} + 2 n

ANS : 1

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