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1. 13 + 23 + 33 + .............. + n3 ধারাটির যোগফল কত?
- A. n(n + 1)2
- B. n(n + 1)2
- C. n(n + 1)2
- D. n(n + 1)2
Answer: Option D
Explanation:
1^3 + 2^3 + 3^3 + ....... + n^3 = {n(n+1)/2}2
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