Lessons

General Aptitude
9.1 Numbers - General Questions

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Q.

How many terms are there in the G.P. 3, 6, 12, 24, ... , 384 ?

View Answer

Correct choice: A

Explanation:

Here a = 3 and r = 6 = 2. Let the number of terms be n.
3

Then, tn = 384   ⇒  arn-1 = 384

⇒ 3 x 2n - 1 = 384

⇒ 2n-1 = 128 = 27

n - 1 = 7

n = 8

∴ Number of terms = 8.

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