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If A=[(1,1,-1),(2,0,3),(3,-1,2)],B=[(1,3...

If `A=[(1,1,-1),(2,0,3),(3,-1,2)],B=[(1,3),(0,2),(-1,4)] and C=[(1,2,3,-4),(2,0,-2,1)]`, find A(BC), (AB)C and show that `(AB)C=A(BC)`.

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