Answer: 2√5.
- A 2√3
- B 2√5
- C 3√2
- D 5
Correct answer: B. 2√5
Explanation: Key relation: GM² = AM × HM (always true for positive numbers). GM² = 5 × 4 = 20. GM = √20 = 2√5.
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