1.

If the coefficient 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 :

Answer»

If the coefficient of x2 and x3 are both zero, in the expansion of the expression (1+ax+bx2)(13x)15 in powers of x, then the ordered pair (a,b) is equal to :



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