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Let a,b and c be in G.P. with common rat...

Let a,b and c be in G.P. with common ratio r, where `a != 0 and 0 lt r le (1)/(2)`. If 3a, 7b and 15c are the first three terms of an A.P., then the `4^(th)` term of this A.P. is

A

`(7)/(3)a`

B

a

C

`(2)/(3)a`

D

`5a`

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The correct Answer is:
B
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