The value of sum(r=1)^(10)sum(s=1)^(10)t...

The value of `sum_(r=1)^(10)sum_(s=1)^(10)tan^(-1)(r/s)` is a)`20pi` b)`25 pi` c)`50pi` d)`100pi`

A

`20pi`

B

`25 pi`

C

`50pi`

D

`100pi`

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The correct Answer is:

B

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