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1. 13+23+33+·····+n3=

A. $\frac{n (n + 1)}{2}$
B. $\frac{n (n + 1)}{2}$
C. $\frac{n (n + 1)}{2}$
D. $\frac{n (n + 1)}{2}$

Answer: Option C

Explanation:

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