Question: 2. Let A be an m x n matrix with entries ajj, for 1 notation to express this as compactly as possible. * What is

2. Let A be an m x n matrix with entries ajj, for 1 notation to express this as compactly as possible. * What is the entry in the j-th row and I-th column of BC? * Show that A(BC) = (AB)C. This shows that matrix multiplication is associative

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