please help use the info from number 7 to do number 8 For problems 7 and 8 , suppose \( A \) is a set with \( |A|=10 \). 7. Let \( B=\left\{(m, n) \in A^{2}: m, n\right\} \). Find \( |B| \). 8. Let \( C=\{D \in \mathscr{P}(A):|D|=3\} \). Find \( |C| \). 2 answers