Find `S_(oo)` of the G.P. whose first term is 28 and the fourth term is `(4)/(49)` .

Explanation

To find the sum to infinity \( S_{\infty} \) of a geometric progression (G.P.) where the first term \( a \) is 28 and the fourth term is \( \frac{4}{49} \), we can follow these steps:

### Step 1: Identify the first term and the fourth term
We know:
- First term \( a = 28 \)
- Fourth term \( a_4 = \frac{4}{49} \)

### Step 2: Use the formula for the nth term of a G.P.
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