Write the following sets in the set-builder form :
$\{ 3,6,9,12\}$
$\{ 3,6,9,12\} = \{ x:x = 3n,n \in N{\rm{ }}$ and ${\rm{ }}1\, \le \,n\, \le \,4\} $
Which of the following is a true statement
Let $A=\{1,2,\{3,4\}, 5\} .$ Which of the following statements are incorrect and why ?
$\{ \{ 3,4\} \} \subset A$
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 $B \subset C,$ then $A \subset C$
Let $A=\{1,2,3,4,5,6\} .$ Insert the appropriate symbol $\in$ or $\notin$ in the blank spaces:
$10 \, ………\, A $
$1 \in A$
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