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