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If the coefficients of x^(2) and x^(3)ar...

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, then the ordered pair (a,b) is equal to (A)` (28, 315)` (B)`(-21, 714) ` (C) `(28, 861)` (D) `(-54, 315)`

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