if a,b,c are in G.P. and 3a, 7b, 15c are...

if a,b,c are in G.P. and 3a, 7b, 15c are first 3 term of A.P. Also the common ratio of G.P. `in(0,(1)/(2))` then the 4th term of A.P is

`(2)/(3)a`

`5a`

`(7)/(3)a`

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