MathematicsMedium64×since 2002Q2980If 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 :A(28, 861)B(28, 315)C(–21, 714)D(–54, 315)Check answerSkip