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The first two terms of a geometric progr...

The first two terms of a geometric progression add upto 12 the sum of the third and the fourth terms is 48, if the terms of the geometric progression are alternately positive and negetive, then the first term is

A

4

B

`-4`

C

`-12`

D

12

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MODERN PUBLICATION-SEQUENCES AND SERIES-EXERCISE
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  18. Find three numbers a,b,c between 2 and 18 such that : their sum is 25....

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  19. Find three numbers a,b,c between 2 and 18 such that : their sum is 25....

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  20. Find three numbers a,b,c between 2 and 18 such that : their sum is 25....

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