Question:
If A = {5, 6, 7}, find P(A).
Solution:
A = {5, 6, 7}
We have to find $P(A)$ which is power set of $A$
The power set of set $A$ is collection of all possible subsets of $A$
The possible subsets of $A$ are $\{\phi\},\{5\},\{6\},\{7\},\{5,6\},\{5,7\},\{6,7\},\{5,6,7\}$
Hence the power $\operatorname{set} P(A)$ will be
$P(A)=\{\{\phi\},\{5\},\{6\},\{7\},\{5,6\},\{5,7\},\{6,7\},\{5,6,7\}\}$
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