Answer: 0.
- A 0
- B 1
- C -1
- D n
Correct answer: A. 0
Explanation: r = -1. When n is even, pairs cancel: (1-1) + (1-1) + ... = 0.
Bar heights for AP 2, 5, 8, 11 with the common difference d=3 marked between consecutive terms.
Concept context
Arithmetic progressions, geometric progressions, and sums