If denotes the power set of and is the void set, then what is the number of elements in ?
Explanation for the correct option.
Step 1: Apply this formula:
If set has elements then has elements.
Since is void set it means that there is no element in set .
Hence, the number of elements in the power set of
Step 2: Put the different values of
When has element.
When has elements.
When has elements.
Hence, option D is correct.