Given `(1-2x+5x^2-10 x^3)(1+x)^n=1+a_1x+a_2x^2+` and that`a1 2=2a_2` then the value of `n` is.

Given (1-2x+5x^2-10x^3)(1+x)^n=1+a_1x+a_2x^2+.... and that a_1^2=2a_2 , then the value of n is

Given (1-2x+5x^(2)-10x^(3))(1+x)^(n)=1+a_(1)x+a_(2)x^(2)+ and that a_(1)^(2)=2a_(2) then the value of n is.

Let (1+x^2)^2(1+x)^n=A_0+A_1x+A_2x^2+…."if" A_0A_1A_2 are in A.P then the value of n is

Let (1+x^2)^2(1+x)^n=A_0+A_1x+A_2x^2+…."if" A_0A_1A_2 are in A.P then the value of n is

If (1+2x +3x^2)^10 = a_0 +a_1x +a_2x^2 + ……+a_20x^20 then a_2/a_1 =

If (1+2x +3x^2)^10 = a_0 +a_1x +a_2x^2 + ……+a_20x^20 then a_1 = ?

If (1+x-2x^2)^6=1+a_1x+a_2x^2+……+a_(12)x^12 then