Question 19
Sequences and SeriesThe fourth term of a geometric sequence is 2 and the sixth term is 8. Find the common ratio.
- A.±1
- B.±2
- C.±3
- D.±4
Show the answer and explanation
Answer: B (±2)
Explanation
ar3 = 2 and ar5 = 8. Dividing, r2 = 4, so r = ±2.