Find out the sum of the coefficients in the expansion of the binomial `(5p - 4q)^n`, where `n` is a +ive integer.

Explanation

To find the sum of the coefficients in the expansion of the binomial \((5p - 4q)^n\), where \(n\) is a positive integer, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Binomial Expansion**:
The binomial theorem states that \((a + b)^n = \sum_{k=0}^{n} \binom{n}{k} a^{n-k} b^k\). In our case, we have \(a = 5p\) and \(b = -4q\).

2. **Sum of Coefficients**:
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