Let $A=\{1,2,3,4,5,6\} .$ Insert the appropriate symbol $\in$ or $\notin$ in the blank spaces:
$ 4\, ......... \, A $
State which of the following sets are finite or infinite :
$\{ x:x \in N$ and $2x - 1 = 0\} $
State whether each of the following set is finite or infinite :
The set of animals living on the earth
List all the subsets of the set $\{-1,0,1\}.$
The number of elements in the set $\{ (a,\,b):2{a^2} + 3{b^2} = 35,\;a,\,b \in Z\} $, where $Z$ is the set of all integers, is