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If the cofficients of x^(3)andx^(4) in...

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

A

`(16,(251)/(3))`

B

`(14,(251)/(3))`

C

`(16,(272)/(3))`

D

`(16,(272)/(3))`

Text Solution

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The correct Answer is:
D
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