Which of the following sets are finite or infinite.
The set of positive integers greater than $100$
Let $A=\{1,2,3,4,5,6\} .$ Insert the appropriate symbol $\in$ or $\notin$ in the blank spaces:
$10 \, .........\, A $
Let $A=\{a, e, i, o, u\}$ and $B=\{a, i, u\} .$ Show that $A \cup B=A$
Which of the following sets are finite or infinite.
$\{1,2,3 \ldots .\}$
Which of the following are sets ? Justify your answer.
The collection of all boys in your class.