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Which term of the GP 2, 8, 32, … equals 131072?
A9th term
B10th term
C7th term
D8th term
Answer & Solution
Correct answer: A. 9th term
a = 2, r = 4. aₙ = 2 · 4^(n−1) = 131072 ⇒ 4^(n−1) = 65536 = 4⁸ ⇒ n = 9.
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