List all the elements of the following sers :
$A = \{ x:x$ is an odd natural number $\} $
Which of the following are sets ? Justify your answer.
A collection of novels written by the writer Munshi Prem Chand.
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\} $
Write the following sets in the set-builder form :
$\{ 3,6,9,12\}$
Which of the following are sets ? Justify your answer.
The collection of ten most talented writers of India.