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

Question

If the coefficients of x^2 and x^3 are both zero, in the expansion of the expression (1 + ax + bx^2)(1 - 3x)^ 15 in powers of x, then the ordered pair (a, b) is equal to:

Accepted Answer

(B)

JEE Main 2019 Mathematics question

Solution