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Write the matrix product AB, if A=[{:(1,...

Write the matrix product AB, if `A=[{:(1,2),(3,4):}]` and `B=[{:(2,0),(0,2):}]`

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The correct Answer is:
`rArrAB=[{:(2,4),(6,8):}]=2[{:(1,2),(3,4):}]`
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