Find the sum of the coefficients of the term expansion `(1+x+2x^(2))^(6)`

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

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

The sum of the coefficients in the expansion of (1+2x-x^2)^(20) is

The sum of the coefficients in the expansion of (1-2x+2x^2)^(2014) is

Show that the sum of the coefficients of the odd terms in the expansion of (1+x)^(2n)" is "2^(2n-1)

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

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

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