Which term of the G.P. 2, 8, 32, … equals 131072?
A7th
B8th
C9th
D10th
Answer & Solution
Correct answer: C. 9th
a=2, r=4; 2·4^{n−1}=131072 ⇒ 4^{n−1}=65536=4^8 ⇒ n=9.
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