A x ( x + 1 ) ( 2 x + 1 )/ 6
B x ( x + 1 )/ 2
C x
D { x ( x + 1 ) 2 } /2
Correct Answer: Option A
সুত্রঃ
1 2+2 2+3 2+ .. . . + n 2 =n( n + 1 ) ( 2 n + 1 )/ 6
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