I've been stuck on this specific problem, "John's Pizzeria offers 3 choices of crust, 3 choices of cheese and 10 choices of toppings. If topping choice can be repeated, how many distinct pizzas with crust, one cheese and two toppings can be ordered?" Ive gotten as far as to do 3C1 * 3C1 *, but after that I go blank because of the specific wording of "If topping choice can be repeated" so I don't know if to use 10C2 20C2 or 10C2 * 2. The answer choices are 702, 405, 330, 165, 495. Thank you very much for your help.