Which of the following is a true statement
$\{a\} \subseteq \{a, b, c\}$
$\{a\} \in \{a, b, c\}$
$\phi \in \{a, b, c\}$
None of these
Which of the following sets are finite or infinite.
$\{1,2,3 \ldots .\}$
Write the set $A = \{ 1,4,9,16,25, \ldots .\} $ in set-builder form.
Examine whether the following statements are true or false :
$\{ a,e\} \subset \{ x:x$ is a vowelin the English alphabet $\} $
The smallest set $A$ such that $A \cup \{1, 2\} = \{1, 2, 3, 5, 9\}$ is
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 $x \notin A$