Answer: 1/3 or 3.
- A 1/3 or 3
- B 2 or 1/2
- C 1 or 1
- D 3 or -3
Correct answer: A. 1/3 or 3
Explanation: Three numbers in GP: a/r, a, ar. Product: a³ = 27, a = 3. Sum: 3/r + 3 + 3r = 13. 3r² - 10r + 3 = 0. (3r-1)(r-3) = 0. r = 1/3 or 3.
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