Question: usenumber 9 info to do number 10 For Problems 9 and 10, ruppose ( A={1,2, ldots, 10}, B ) is a set with ( |B|=11

usenumber 9 info to do number 10 For Problems 9 and 10, ruppose $ A=\{1,2, \ldots, 10\}, B $ is a set with $ |B|=11 $, and $ |A \cap B|=8 $. 9. Find $ |A \cup B| $. 10. Suppose $ C \subset A \times B $ with $ |C|=31 $, an 2 answers

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