If |A| = k and |B| = m, how many relations are there between A and B? If in addition, |C| = n, how many ternary relations are there in A X B X C?
[Hint: recall the definition of a relation, and use of cardinality.]
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In general there are relations between X & Y.
(Be careful. That number includes the empty relation some texts/instructors object.)
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