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12. Let 1 -1 1 -1 0 -1 2 and C = B = 1 A = 3 1 3 -2 3 Show that

12. Let 1 -1 1 -1 0 -1 2 and C = B = 1 A = 3 1 3 -2 3 Show that A(BC) = (AB)C and (AB)" = B" AT .

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