Answer: 19.
- A 17
- B 19
- C 21
- D 23
Correct answer: B. 19
Explanation: a = 3, d = 4. a<sub>5</sub> = 3 + 4(5-1) = 3 + 16 = 19.
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