If `ab ne 0` and the sum of the coefficient of `x^7 and x^4` in the expansion of `((x^2)/(a)-(b)/(x))^11` zero, then

If ab ne 0 and the sum of the coefficients of x^(7) and x^(4) in the expansion of ((x^(2))/a-b/x)^(11) is zero, then ab=____

If sum of the coefficients of x^(7) and x^(4) in the expansion of ((x^(2))/a-b/x)^(11) is zero, then

If sum of coefficient of x^7 and x^4 in the expansion of (x^2/a -b/x)^11 is zero then

The coefficient of x^4 in the expansion of (1+x-2x^2)^7 is

The coefficient of x^4 in the expansion of (1+x-2x^2)^7 is :

The coefficient of x^4 in the expansion of (1+x-2x^2)^7 is

Find the coefficient of x^7 in the expansion of (x^(2) +1/x)^(11)

Find the coefficient of (ii) x^7 in the expansion of (x^(2) + (1)/(x) )^(11)

The coefficient of x^4 in the expansion of (1+x+x^2+x^3)^11 is