If $Q = \left\{ {x:x = {1 \over y},\,{\rm{where \,\,}}y \in N} \right\}$, then
$0 \in Q$
$1 \in Q$
$2 \in Q$
${2 \over 3} \in Q$
Let $A=\{a, e, i, o, u\}$ and $B=\{a, b, c, d\} .$ Is $A$ a subset of $B ?$ No. (Why?). Is $B$ a subset of $A ?$ No. (Why?)
Assume that $P(A)=P(B) .$ Show that $A=B$.
Which of the following are examples of the null set
Set of even prime numbers
In each of the following, determine whether the statement is true or false. If it is true, prove it. If it is false, give an example.
If $A \subset B$ and $B \in C,$ then $A \in C$
Which of the following are sets ? Justify your answer.
The collection of all even integers.