# Intersection Requirement

How many ordered pairs $$(A, B)$$, where $$A, B$$ are subsets of $$\{ 1, 2, 3, 4, 5\}$$ are there, such that $$| A \cap B | = 1$$?

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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