Let M - -1 -2- and N - - 2 1 -1 2 - -show that MN exists and write its order-

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Multiplication of Matrices

Let M = [1 -2...

Question

Let M = [1 -2] and N = $[\begin{matrix} 2 & 1 - 1 & 2 \end{matrix}] .$
show that MN exists and write its order.

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