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How many ordered pairs (A,B) (A, B) (A,B), where A,BA, BA,B are subsets of {1,2,3,4,5} \{ 1, 2, 3, 4, 5\} {1,2,3,4,5} are there, such that ∣A∩B∣=1 | A \cap B | = 1 ∣A∩B∣=1?
Details and assumptions
Students who are unfamiliar with Set Notation can refer to the blog post on Set Notation for definitions.
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