Let $S=\{1,2,3,4\}$. The total number of unordered pairs of disjoint subsets of $S$ is equal to
$25$
$34$
$42$
$41$
Total number of unordered pairs of disjoint subsets
$=\frac{3^4+1}{2}=41 \text {. }$
Write down all the subsets of the following sets
$\{ 1,2,3\} $
If $A = \{ 1,\,2,\,3,\,4,\,5\} ,$ then the number of proper subsets of $A$ is
State whether each of the following set is finite or infinite :
The set of letters in the English alphabet
State which of the following sets are finite or infinite :
$\{ x:x \in N$ and $2x – 1 = 0\} $
Consider the sets
$\phi, A=\{1,3\}, B=\{1,5,9\}, C=\{1,3,5,7,9\}$
Insert the symbol $\subset$ or $ \not\subset $ between each of the following pair of sets:
$A \ldots C$
