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Which of the following are valid operations? The matrices are repeated here for convenience: A= 21,1 11,2 a 2,1 2,2 23,1 3,2 24,1 4,2 B=

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Which of the following are valid operations? The matrices are repeated here for convenience: A= 21,1 11,2 a 2,1 2,2 23,1 3,2 24,1 4,2 B= 11,1 11,2 1,3 11,4 b2,1 2,2 2,3 2,4 C1,1 C2,1 C3,1 C4,1 d1,1 21,2 D= d2,1 02,2 AD D-2 |A|(i.e., the determinant of A) d BA BAT CA

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