Question

Let $A=\{a,b,c,d\},B=\{a,b,c\},C=\{b,d,e\}$ then, find the sets D and E satisfying following condition.

$D\subset A,D\ne B$

Answer 1

We can form many sets of D where it is a subset of A and not equal to B
For example, $D=$ { $a,b$ }