Write the following sets in roster form :
$D = \{ x:x$ is a prime number which is divisor of $60\} $
What universal set $(s)$ would you propose for each of the following :
The set of isosceles triangles
Which of the following sets are finite or infinite.
The set of months of a year
Let $A=\{a, e, i, o, u\}$ and $B=\{a, i, u\} .$ Show that $A \cup B=A$
Let $A=\{1,2,3,4,5,6\} .$ Insert the appropriate symbol $\in$ or $\notin$ in the blank spaces:
$ 2 \, ....... \, A $