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Cartesian product A × B has cardinality:

A|A| × |B|
B|A|
C|A| + |B|
D|B|
Answer & Solution
Correct answer: A. |A| × |B|
A × B = set of ordered pairs (a, b) with a ∈ A, b ∈ B. |A × B| = |A| × |B|. e.g., {1,2}×{a,b} has 4 pairs.
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