Fundamentholfundamenthol
JEE Main2019Math
Q.

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. A

    (– 54, 315)

  2. B

    (28, 861) 

  3. C

    (–21, 714)

  4. D

    28, 315 

Solution

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