If the coefficients of x^(3) and x^(4) i...

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:

A

`(16,251/3)`

B

`(14,251/3)`

C

`(14,272/3)`

D

`(16,272/3)`

Verified by Experts

The correct Answer is:

D

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