How to find the sum of all coefficients in the any expansion .

How to find the sum of all coefficients in the binomial expansion.

Find the sum of all the coefficients in the binomial expansion of (x^2+x-3)^(319)dot

Find the sum of all the coefficients in the binomial expansion of (x^(2)+x-3)^(319)

Find the sum of all the coefficients in the binomial expansion of (x^2+x-3)^(319)dot

Find the sum of all the coefficients in the binomial expansion of (x^2+x-3)^(319)dot

What is the sum of all the coefficients in the expansion of (1+x)^(n) ?

Find the sum of last 20 coefficients in the expansions of (1+x)^(39).

Find the sum of last 20 coefficients in the expansions of (1+x)^(39).

If the sum of the coefficients in the expansion of (1-3x+10x^2)^n is a and if the sum of the coefficients in the expansion of (1+x^2)^n is b, then