Is S is the sum of the first 10 terms of the series ^ -1 ( 1 3 )+ ^ -1 ( 1 7 )+ ^ -1 ( 1 13 )+ ^ -1 ( 1 21 )+...

Question

Is S is the sum of the first 10 terms of the series ^ -1 ( 1 3 )+ ^ -1 ( 1 7 )+ ^ -1 ( 1 13 )+ ^ -1 ( 1 21 )+ , then tan(S) is equal to :

Accepted Answer

(D)

JEE Main 2020 Mathematics question