Let $A=\{1,2,3,4,5,6\} .$ Insert the appropriate symbol $\in$ or $\notin$ in the blank spaces:
$ 5\, .......\, A$
$5 \in A$
State whether each of the following set is finite or infinite :
The set of letters in the English alphabet
Let $S = \{ 0,\,1,\,5,\,4,\,7\} $. Then the total number of subsets of $S$ is
In the following state whether $\mathrm{A = B}$ or not :
$A = \{ x:x$ is a multiple of $10\} ;B = \{ 10,15,20,25,30 \ldots \ldots \} $
The set of lines which are parallel to the $x\,-$ axis
The set $A = \{ x:x \in R,\,{x^2} = 16$ and $2x = 6\} $ equals
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