A set and a set are given. How many elements does have?

Answer and explanation

Correct answer: A. , since the union is

  1. Step 1: The union contains every element that is in or in , counted once. Step 2. The common elements 2, 4, 6 are counted once: . **Answer: . Why not the others:** 11 double-counts the intersection, and 3 is the size of the intersection.

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