Question 1083516
If each pizza requires 4 toppings, then the number of different pizzas you could make is 13 choose 4, or 715 different combinations. If the pizzas can have less than 4 toppings each, then you can make [13x12x11x10]+1, or 17,161 different pizzas (the last one would be a no-topping, plain cheese pizza). &#9786;&#9786;&#9786;&#9786;