If the coefficients of x^3 and x^4 in the expansion of (1+ax+bx^2 )(1-2x)^ 18 in powers of x are both zero,...

Question

If the coefficients of x^3 and x^4 in the expansion of (1+ax+bx^2 )(1-2x)^ 18 in powers of x are both zero, then (a,b) is equal to

Accepted Answer

(D)

JEE Main Mathematics question