Final answer:
There are 20 different 3-topping pizzas possible.
Step-by-step explanation:
To find the number of different 3-topping pizzas possible, we need to use combinations. A combination is a selection of items where the order does not matter. In this case, we have 6 toppings to choose from and we need to choose 3 of them to make a pizza. We can use the formula for combinations, which is:
C(n, r) = n! / (r!(n-r)!)
Where n is the total number of items and r is the number of items we want to choose.
Using this formula, we can calculate the number of different 3-topping pizzas possible:
C(6, 3) = 6! / (3!(6-3)!)
C(6, 3) = 6! / (3! * 3!)
C(6, 3) = (6 * 5 * 4) / (3 * 2 * 1)
C(6, 3) = 20
Therefore, there are 20 different 3-topping pizzas possible.