If A has 5 elements and B has 4 elements, and A ∩ B has 2 elements, then A ∪ B has $x$ elements.
Answer (integer)
7
Solution
|A ∪ B| = |A| + |B| - |A ∩ B| = 5 + 4 - 2 = 7.
About this question
Subject: Mathematics · Chapter: Sets, Relations and Functions · Topic: Sets and Operations
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