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If [x] denotes the greatest integer lex ...

If [x] denotes the greatest integer `lex` and `n inN` then value of `I_n=int_0^(n^2) [sqrtx]dx` is

A

1/6(n-1)n(4n+1)

B

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

C

1/6(n-1)(n)(2n-1)

D

1/6(n-1)(3n+5)

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The correct Answer is:
A
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