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Matrix Addition, Multiplication and Row Reductions

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I am having problems with numbers 1-5 of the attached document. I understand numbers 6-10, but I can't seem to comprehend how to solve numbers 1-5.

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Matrix Addition, Multiplication and Row Reductions are investigated.

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1 A+B =

2.
is not defined. The addition and subtraction of matrices is done only if they are ...

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