Let and be two matrices

MATHEMATICS · Single correct · CBSE · Mathematics · Matrices · Matrices

Problem

Let A=[3−57−12]A=\begin{bmatrix}3&-5\\7&-12\end{bmatrix} and B=[12−57−3]B=\begin{bmatrix}12&-5\\7&-3\end{bmatrix} be two matrices. Then (AB)−1(AB)^{-1} is (a) [100−1]\begin{bmatrix}1&0\\0&-1\end{bmatrix} (b) [1001]\begin{bmatrix}1&0\\0&1\end{bmatrix} (c) [−1001]\begin{bmatrix}-1&0\\0&1\end{bmatrix} (d) [0110]\begin{bmatrix}0&1\\1&0\end{bmatrix}

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