List all the elements of the following sers :
$A = \{ x:x$ is an odd natural number $\} $
Let $A=\{1,2,\{3,4\}, 5\} .$ Which of the following statements are incorrect and why ?
$\{ \{ 3,4\} \} \subset A$
The number of non-empty subsets of the set $\{1, 2, 3, 4\}$ is
Assume that $P(A)=P(B) .$ Show that $A=B$.
Let $A=\{1,2,\{3,4\}, 5\} .$ Which of the following statements are incorrect and why ?
$\{1,2,3\}\subset A$