Let $A=\{1,2,3,4,5,6\} .$ Insert the appropriate symbol $\in$ or $\notin$ in the blank spaces:
$ 0\, ........\, A $
$0 \notin A$
Examine whether the following statements are true or false :
$\{ a,b\} \not\subset \{ b,c,a\} $
Write the following sets in roster form :
$C = \{ x:x{\rm{ }}$ is a two-digit natural number such that sum of its digits is $8\} $
Write down all the subsets of the following sets
$\{ 1,2,3\} $
Write the following sets in the set-builder form :
$\{ 1,4,9 \ldots 100\} $
Write the set $A = \{ 1,4,9,16,25, \ldots .\} $ in set-builder form.
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