Sequence And Series Question 603
Question: The 6th term of a G.P. is 32 and its 8th term is 128, then the common ratio of the G.P. is
[Pb. CET 1999]
Options:
A) - 1
B) 2
C) 4
D) - 4
Show Answer
Answer:
Correct Answer: B
Solution:
$ T_6=32 $ and $ T_8=128\Rightarrow ar^{5}=32 $ …..(i) and $ ar^{7}=128 $ …..(ii) Dividing (ii) by (i), $ r^{2}=4 $
Þ r = 2.
BETA
