12 + 22 + 32 + ................. + x2 এর মান কত?

A    x ( x   +   1 ) ( 2 x   +   1 )/ 6

B    x ( x   +   1 )/ 2

C    x

D    { x ( x   +   1 ) 2 } /2

Solution

Correct Answer: Option A

 

সুত্রঃ

1 2+2 2+3 2+   .. . .   +   n 2 =n( n   +   1 ) ( 2 n  +   1 )/ 6

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