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Question

How many terms of G.P. 3, 32, 33, … are needed to give the sum 120?

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Solution

The given G.P. is 3, 32, 33, …

Let n terms of this G.P. be required to obtain the sum as 120.

Here, a = 3 and r = 3

n = 4

Thus, four terms of the given G.P. are required to obtain the sum as 120.


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