Are the following pair of sets equal ? Give reasons.

$A = \{ x:x$ is a letter in the word ${\rm{FOLLOW }}\} $

$B = \{ y:y$ is a letter in the word $WOLF\} $

Which of the following sets are finite or infinite.

The set of months of a year

Make correct statements by filling in the symbols $\subset$ or $ \not\subset $ in the blank spaces:

$\{ 2,3,4\}  \ldots \{ 1,2,3,4,5\} $

Which of the following are examples of the null set

Set of even prime numbers

If a set $A$ has $n$ elements, then the total number of subsets of $A$ is