Which of the following sets are finite or infinite.
The set of months of a year
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 $x \in A$ and $A \not\subset B$, then $x \in B$
Let $A=\{1,2,\{3,4\}, 5\} .$ Which of the following statements are incorrect and why ?
$\varnothing \in A$
Write down all the subsets of the following sets
$\emptyset $
Which of the following sets are finite or infinite.
$\{1,2,3 \ldots .\}$