$\text { If }\left[\begin{array}{cc}a & b \\a_{1} & b_{1}\end{array}\right]$ $\left[\begin{array}{cc}3 & -5 \\-1 &2\end{array}\right]$ $=\left[\begin{array}{cc}1 & -1 \\2 & 0\end{array}\right]$ $\text { then the values of } \mathrm{a} \text { and } \mathrm{b} \text { are- }$

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