Answer: 10/11.
- A 9/10
- B 10/11
- C 11/12
- D 1
Correct answer: B. 10/11
Explanation: The series telescopes to 1 − 1/(n+1). For n = 10 this is 1 − 1/11 = 10/11.
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