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A={:[(1,2,3,-4),(-1,8,3,2)]:},B={:[b(ij)...

`A={:[(1,2,3,-4),(-1,8,3,2)]:},B={:[b_(ij)]:}_(mxxn)`. Find the value of m and n for which A+B can be defined.

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For A+B to be defined, order of A and B should be equal hence m=2, n=4 .
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