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The mean of the squares of the numbers 1...

The mean of the squares of the numbers 1,2,3,4, `cdots` n is

A

`(1)/(6)(n+1)(2n+1)`

B

`(1)/(6)(n+1)`

C

`(1)/(6)(2n+1)`

D

None of these

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The correct Answer is:
A
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