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How many terms of the G.P. 3,3//2,3//4, ...

How many terms of the G.P. `3,3//2,3//4, ` be taken together to make `(3069)/(512)?`

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ATQ,
Sum of the terms `S_n = 3069/512`
First term `a=3` Common ratio `r=(3/2)/3 =(3/2)xx(1/3) = 1/2`
We know that, `S_n =(a(1−r^n ))/(1−r)` ...
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