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If A=[(2,1,1),(3,-1,0),(0,2,4)], B=[(9,7...

If `A=[(2,1,1),(3,-1,0),(0,2,4)], B=[(9,7,-1),(3,5,4),(2,1,6)] and C=[(2,-4,3),(1,-1,0),(9,4,5)].` Varify associative law for matrix addition.

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