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A and B arenon-empty sets such that absA...

A and B arenon-empty sets such that `absA` = m, `absB` = n. How many relations can be defined from A to B ? ( Remember that the number of relations is the number of subsets of `A xx B`) .

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`absA` = m, `absB` = n
`rArr abs (A xx B)` = mn
A relations is a from of A to B
= Number of subset of `A xx B`
`2^mn (because abs(A xx B) = mn)
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