Find the sum of the coefficients in the expansion of `(1+2x+3x^2+ n x^n)^2dot`

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

Suppose the sum of the coefficients in the expansion of (1 - 5x + 12x^(3))^(n) is a and the sum of the coefficients in the expansion of (1 - 2x + 3x^(2))^n is b. If a = b^(m) , then m = ___

The sum of the coefficient in the expansion of (1+ax-2x^(2))^(n) is

The sum of the coefficients in the expansion of (1 +x-3x^(2))^(4321) is

Write the sum of the coefficients in the expansion of (1-3x+x^(2))^(111)

If a\ a n d\ b denote the sum of the coefficients in the expansions of (1-3x+10 x^2)^n a n d\ (1+x^2)^n respectively, then write the relation between a\ a n d\ bdot

The sum of the coefficients in the expansion of (1 - x + x^(2) - x^(3))^(n) ,is