Write the following sets in the set-builder form :
$\{ 3,6,9,12\}$
Let $A=\{1,2,\{3,4\}, 5\} .$ Which of the following statements are incorrect and why ?
$\{1,2,3\}\subset A$
Write the set $A = \{ 1,4,9,16,25, \ldots .\} $ in set-builder form.
Write the following sets in the set-builder form :
${\rm{\{ 5,25,125,625\} }}$
Which of the following are sets ? Justify your answer.
The collection of ten most talented writers of India.