Finding the Number of Subsets of a Set

A restaurant offers butter, cheese, chives, and sour cream as toppings for a baked potato. How many different ways are there to order a potato?

Work it out on paper first. Then open the solution one step at a time, and stop as soon as you can finish on your own.

Solution
We are looking for the number of subsets of a set with 4 objects. Substitute $n = 4$ into the formula.
$\begin{array}{l} 2^{n} = 2^{4} \\ = 16 \end{array}$

There are 16 possible ways to order a potato.

Your turn

The book's Try It right after this example: same idea, new numbers. Only the answer is given.

A sundae bar at a wedding has 6 toppings to choose from. Any number of toppings can be chosen. How many different sundaes are possible?

How did it go?