Which of the following are sets ? Justify your answer.
A team of eleven best-cricket batsmen of the world.
Write the following sets in the set-builder form :
${\rm{\{ 2,4,8,16,32\} }}$
In rule method the null set is represented by
Write down all the subsets of the following sets
$\{ a\} $
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 $x \notin B,$ then $x \notin A$