Use the formula for the cardinal number of the union of two sets to solve the problem. Set A contains 6 elements, set B contains 13 elements, and 4 elements are common to sets A and B. How many elements are in A ? B? A) 15 B) 19 C) 16 D) 14
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We want to find the number of elements in the union of sets A and B, which is denoted by $|A \cup B|$. We can use the formula for the cardinal number of the union of two sets: $|A \cup B| = |A| + |B| - |A \cap B|$, where $|A \cap B|$ is the number of elements Show more…
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