13 + 23 + 33 + 43 + ............... + 203 = কত?
Solution
Correct Answer: Option B
13+23+...+n3 = (n(n+1)/2)2
ফলে,
(n(n+1)/2)2
= [20(20+1)/2]2
= [10*21]2
= 44100
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