Statement - I :Mean of square of first n...

Statement - I :Mean of square of first n natural numbers is `((n+1)(2n+1))/(6)`
Statement - II : `Sigman=(n(n+1))/(2)`

Statement - I is true, Statement - II is true and Statement - II is a correct explanation for Statement - I.

Statement - I is true, Statement-II is true but Statement - II is not a correct expalnation of Statement - I.

Statement - I is true, Statement -II is false.

Statement -I is false, Statement -II is true.

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The correct Answer is:

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Mean of first n natural numbers is

`(n(n-1))/2`

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

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

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

`n^(2)`

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

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

`[(n(n+1))/(2)]^(2)`

none of these