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If A=[{:(1,2,-3),(5,0,2),(1,-1,1):}],B=[...

If `A=[{:(1,2,-3),(5,0,2),(1,-1,1):}],B=[{:(3,-1,2),(4,2,5),(2,0,3):}]andC=[{:(4,1,2),(0,3,2),(1,-2,3):}]`then compute (A+B)and(B+C). Also verify that `A+(B-C)=(A+B)-C` .

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The correct Answer is:
`A+B=[{:(4,1,-1),(9,2,7),(3,-1,4):}],B-C[{:(-1,-2,0),(4,-1,3),(1,2,0):}]`
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