Exercise 1.

A pizza parlor offers 10 toppings.

  1. How many 3-topping pizzas could they put on their menu? Assume double toppings are not allowed.

  2. How many total pizzas are possible, with between zero and ten toppings (but not double toppings) allowed?

  3. The pizza parlor will list the 10 toppings in two equal-sized columns on their menu. How many ways can they arrange the toppings in the left column?

Solution.
in-context