Answer: 40.
- A 30
- B 35
- C 40
- D 45
Correct answer: C. 40
Explanation: a = 5, r = 2. a<sub>4</sub> = 5 × 2<sup>4-1</sup> = 5 × 8 = 40.
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