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Q.
How many terms are in the G.P. 3, 6, 12, 24, ......., 384 ?
A.
8
B.
9
C.
10
D.
11
View Answer
Correct choice: A
Explanation:
Here a = 3 and r = 6/3 = 2. Let the number of terms be n. Then, t = 384 => a * r^(n-1) = 384 => 3 * 2^(n-1) = 384 => 2^(n-1) = 128 = 2^(7) => n-1 = 7 => n = 8.
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