Let $A=\{1,2,\{3,4\}, 5\} .$ Which of the following statements are incorrect and why ?
$\varnothing \in A$
State which of the following sets are finite or infinite :
$\{ x:x \in N$ and $x$ is prime $\} $
The set $A = \{ x:x \in R,\,{x^2} = 16$ and $2x = 6\} $ equals
Examine whether the following statements are true or false :
$\{ a,e\} \subset \{ x:x$ is a vowelin the English alphabet $\} $
Let $A=\{1,2,\{3,4\}, 5\} .$ Which of the following statements are incorrect and why ?
$\{\varnothing\} \subset A$