Find out the sum of the coefficients in ...

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

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Putting p = q in `(5p- 4q)^(n)`, the required sum of coefficients = ` (5-4)^(n) = 1^(n) = 1`

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