Answer: 2/3.
- A 2/3
- B 1/2
- C 3/4
- D 1/3
Correct answer: A. 2/3
Explanation: Infinite GP: first term a=1, common ratio r=−1/2 (|r|<1). Sum = a/(1−r) = 1/(1+½) = 1/(3/2) = 2/3.
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