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

-এর মান কত?

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

\frac{x (x + 1)}{2}

{\frac{x (x + 1)}{2}}^{2}

ANS : 1

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