Question 12
Sequences and SeriesThe fourth term of an exponential sequence is 192 and its ninth term is 6. Find the common ratio of the sequence.
- A.1/3
- B.1/2
- C.2
- D.3
Show the answer and explanation
Answer: B (1/2)
Explanation
ar⁸ ÷ ar³ = r⁵ = 6/192 = 1/32, so r = ½.