Question

.List all subsets of{ , , , , },containing but not containing

Answer 1

List all subsets of $\{a, b, c, d, e\},$ containing $a$ but not containing $b.$

$$\{a\},\{a,c\},\{a,d\},\{a,e\},$$

$$\{a,c,d\},\{a,c,e\},\{a,d,e\},\{a,c,d,e\}$$