13+23+33+.......+n3=কত?
A
n(n+1)2
B
n(n+1)22
C
(n+1)(2n+1)6
D
n(n+1)24
Correct Answer: n(n+1)22
13 + 23 + 33 + ....... + n3 = <math xmlns = "http://www.w3.org/1998/Math/MathML"> <msup> <mfenced open = "{" close = "}"> <mfrac> <mrow> <mi>n</mi> <mo>(</mo> <mi>n</mi> <mo> + </mo> <mn>1</mn> <mo>)</mo> </mrow> <mn>2</mn> </mfrac> </mfenced> <mn>2</mn> </msup> </math>