If b is very small as compared to the va...

If b is very small as compared to the value of a, so that the cube and other higher powers of `(b)/(a)` can be neglected in the identity `(1)/(a-b)+(1)/(a-2b)+(1)/(a-3b)+...+(1)/(a-nb)=alphan+betan^(2)+lambdan^(3)`, then the value of `lambda` is :

A

`(a^2+b)/(3a^3)`

B

`b^2/(3a^3)`

C

`(a+b^2)/(3a^3)`

D

`(a+b)/(3a^2)`

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The correct Answer is:

B

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