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If a matrix has 8 elements, what are ...

If a matrix has 8 elements, what are the possible orders it can have? What if it has 5 elements?

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`(8 xx 1),(1 xx 8),(4 xx 2),(2 xx 4)`
If it has `5` elements, then the possible orders are `(5 xx 1), (1 xx 5)`
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