Answer: 9, 13, 17.
- A 9, 13, 17
- B 8, 12, 16
- C 10, 14, 18
- D 8, 13, 17
Correct answer: A. 9, 13, 17
Explanation: 5 numbers in AP: 5, A, B, C, 21. d = (21-5)/4 = 4. Means: 9, 13, 17.
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