In the expansion of `(1+ax+bx^(2))(1-3x)^(15)`, if coefficient of `x^(2)` and `x^(3)` is 0 then ordered pair `(a,b)` is equal to

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

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 (A) (28, 315) (B) (-21, 714) (C) (28, 861) (D) (-54, 315)

In the expansion of (ax+b)^(2020) , if the coefficient of x^(2) and x^(3) are equal, then the value of (9)/(100)((b)/(a)) is equal to

In the expansion of (ax+b)^(2020) , if the coefficient of x^(2) and x^(3) are equal, then the value of (9)/(100)((b)/(a)) is equal to

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

If the coefficient of x^(7) in the expansion of (ax^(2)+b^(-1)x^(-1))^(11) is equal to the coefficient of x^(-7) in (ax-b^(-1)x^(-2))^(11) , then ab equals:

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

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: