Answer: 2.
- A 1
- B 2
- C 3
- D 4
Correct answer: B. 2
Explanation: a + 2d = 7 and a + 6d = 15. Subtracting: 4d = 8, d = 2.
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