The value of sum(r=1)^n 1/(sqrt(a+rx) + ...

The value of `sum_(r=1)^n 1/(sqrt(a+rx) + sqrt(a+(r-1)x))` is :

A

`n/(sqrt(a)+sqrt(a+nx))`

B

`(sqrt(a+nx)-sqrt(a))/x`

C

`(nsqrt(a+nx)-sqrt(a))/x`

D

`n/(sqrt(a+nx)-sqrt(a))`

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The correct Answer is:

A, B

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