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 :
JEE · Math · previous-year question
- A.(28, 861)
- B.(28, 315)
- C.(–21, 714)
- D.(–54, 315)
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