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tan^-1S=tan^-1(1/(n^2+n+1))+tan^-1(1/(n^...

`tan^-1S=tan^-1(1/(n^2+n+1))+tan^-1(1/(n^2+3n+3))+....+tan^-1(1/(1+(n+19)(n+20)))` હોય તો S =........

A

`20/(401+20n)`

B

`n/(n^2+20n+1)`

C

`20/(n^2+20n+1)`

D

`n/(401+20n)`

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