13 +23 +33 +....+ n3 = কত?
A \(\frac{{n(n + 1)}}{2}\)
B \({\{ \frac{{n(n + 1)}}{2}\;\} ^{2\;}}\)
C \(\frac{{n(n + 1)(2n + 1)}}{6}\)
D \(\frac{{n{{(n + 1)}^2}}}{4}\)
Correct Answer: Option B
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