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In a G.P the sum of the first and last t...

In a G.P the sum of the first and last terms is 66, the product of the second and the last but one is 128, and the sum of the terms is 126
If the decresing G.P is considered , then the sum of infinite terms is

A

2

B

`3//2`

C

3

D

`9//2`

Text Solution

Verified by Experts

The correct Answer is:
B, C
We have
`p/(1-1//p)=9/2`
or `2p^(2)-9p+9=0`
or p=3/2,3
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CENGAGE ENGLISH-PROGRESSION AND SERIES-EXERCIESE ( MULTIPLE CORRECT ANSWER TYPE )
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