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\sum_{1}^{n} r^{2}

এর সমষ্টির মান কত?

\frac{n (n + 1) (2 n + 1)}{6}

\frac{n (n + 1)}{6}

\frac{(n + 1) (2 n + 1)}{6}

\frac{n (2 n + 1)}{6}

ANS : 1

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