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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,

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If the coefficients of x2 and x3 are both zero, in the expansion of the expression (1 + ax + bx2 ) (1 – 3x)15 in powers of x, then the ordered pair (a,b) is equal to : 

(1)  (28, 861)

(2)  (28, 315)

(3)  (–21, 714) 

(4)   (–54, 315)

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Correct option  (2) (28, 315)

Explanation:

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