Let $A = \{1, 2, 3, 4, 5, 6\}$. Insert the appropriate symbol $\in$ or $\notin$ in the blank space:
$4 \dots A$

Write down all the subsets of the following set: $\{1, 2, 3\}$.

In each of the following,determine whether the statement is true or false. If it is true,prove it. If it is false,give an example.
If $A \subset B$ and $B \subset C$,then $A \subset C$.

If $A = \{1, 2, 3, 4, 5, 6\}$, then which of the following statements is false?

Which of the following is a set? Justify your answer.
$A$ team of eleven best cricket batsmen of the world.

In the following,state whether $A=B$ or not:
$A=\{a, b, c, d\} ; B=\{d, c, b, a\}$