Mathematics · Relations and Functions
Let A = {1, 3, 4, 6, 9} and B = {2, 4, 5, 8, 10}. Let R be a relation defined on A × B such that R = {((a1, b1), (a2, b2)) : a1 < b2 and b1 < a2}. Then the number of elements in the set R is:
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