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

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

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