If upto 20 terms, then what is the value of A? upto 20 terms A =

| If
upto 20 terms, then what is the value of A?

A. 379/308
B. 171/140
C. 379/310
D. 420/341
Please scroll down to see the correct answer and solution guide.
Right Answer is: D
SOLUTION
upto 20 terms
A =
A =
A =
A =
A =
A =
A =
A =
A =