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 $x$ is prime $\} $

Which of the following are sets ? Justify your answer.

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The set $A = \{ x:x \in R,\,{x^2} = 16$ and $2x = 6\} $ equals

In the following state whether $\mathrm{A = B}$ or not :

$A = \{ 2,4,6,8,10\} ;B = \{ x:x$ is positiveeven integer and $x\, \le \,10\} $

The number of elements in the set $\{x \in R :(|x|-3)|x+4|=6\}$ is equal to