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1^{3}

2^{3}

3^{3}

n^{3}

=কত?

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

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

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

\frac{n (n + 1)^{2}}{4}

ANSWER : 2

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