The sum of square of the first n natural numbers is given by:

1.	The sum of square of the first n natural numbers is given by:
A.	n(n+1)(2n+1)/6
B.	n(n-1)/2(2n+1)
C.	n<sup>2</sup>(n+1)(2n+1)/6
D.	None of the mentioned
Answer» B. n(n-1)/2(2n+1)

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