Use the formula for the cardinal number of the union of two sets to solve the problem. Set A contains 5 elements, set B contains 11 elements, and 3 elements are common to sets A and B. How many elements are in A ? B? 14 13 16 12
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We want to find the number of elements in the union of sets $A$ and $B$, which we can denote as $|A \cup B|$. We can use the formula for the cardinal number of the union of two sets: $|A \cup B| = |A| + |B| - |A \cap B|$. Show more…
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