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Question

How many terms of the G.P. 3,32,34..... are needed to give the sum 3069512 ?


Solution

Here, a = 3 and common ratio 12

Sn=3069512=3(112n)12

112n=3069512×6=1023512×2

110231024=12n

12n=11024

n=10


Mathematics
RD Sharma
Standard XI

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