Question

Let S={a,b}.how many elements does the power set 2s contain?

Answer 1

Let $S = \{a, b\}$. How many elements does the power set $2^S$ contain?

**Solution.**

The power set $2^S$ contains these elements: $\{a, b\}, \{a\}, \{b\}, \emptyset$.

**Answer:** 4 elements.