Given a G.P. with a = 729 and `7^(t h)`term 64, determine `S_7`.

Explanation

To solve the problem step by step, we will follow the process of finding the common ratio of the geometric progression (G.P.) and then calculating the sum of the first seven terms.

### Step 1: Identify the given information
We are given:
- First term \( a = 729 \)
- Seventh term \( a r^6 = 64 \)

### Step 2: Set up the equation for the seventh term
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