If the coefficients of x2 and x3 are both ero, 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:

If the coefficients of $\mathrm{x}^{2}$ and $\mathrm{x}^{3}$ are both zero, in the expansion of the expression $\left(1+a x+b x^{2}\right)(1-3 x)^{15}$ in powers of $x$, then the ordered pair $(a, b)$ is equal to: