If upto terms, then is:
- (A)
- (B)
- (C)
- (D)✓ Correct
Answer: (D)
Solution
The terms are , that is , so the th term is . Since
the sum from to telescopes to . Hence
so and .
the sum from to telescopes to . Hence
so and .
JEE Main · 2021 · 17 Mar 2021 · Shift 1 · Single correct option