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Question

The 7th term of a G.P. is 8 times the 4th term. Find the G.P. When its 5th term is 48

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Solution

Given that t7=8t4ar6=8ar3
r3=8=23r=2
Also t5=48ar4=48 or 16a=48a=3.
Hence the required G.P. is 3,6,12,24..........

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