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Which of the following lists of numbers is/are an Geometric Progression :

(A) 2, 4, 8, 16, 32,........

(B) 3, 9, 27, 81,.......

(C) -3, -6, -12, -24,.......

(D) 21, 18,15,.......

Choose the correct answer from the options given below:

Solution

✅ Correct Option: 1

A geometric progression has a constant ratio between consecutive terms.

In (A) the ratio is 22, in (B) it is 33, and in (C) it is 22 as well.

In (D) the terms decrease by a constant difference of 33, so it is an arithmetic progression. Hence (A), (B) and (C) only.

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