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

Explanation

To solve the problem, we need to find the sum of the first 7 terms of a geometric progression (G.P.) where the first term \( a = 729 \) and the 7th term \( A_7 = 64 \).

### Step-by-Step Solution:

1. **Identify the terms of the G.P.**:
- The first term \( a = 729 \).
- The 7th term \( A_7 \) can be expressed as:
\[
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