Posted by **marie ** on Monday, August 22, 2011 at 12:33pm.

using the fundamental counting principle with three or more groups of items

A pizza can be ordered with three choices of size (small, medium, or large), four choices of crust (thin,thick,crispy, or regular, and six choices of toppings (ground beef, sausage, pepperoni, bacon, mushroom, or onions). How many one-topping pizzas can be ordered?

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**MathMate**, Monday, August 22, 2011 at 4:00pm
There are three choices of size, four choices of crust and six choices of toppings.

These choices are independent of each other, so by the principle of multiplication, the number of one-topping pizzas is:

N=3*4*6 = 72

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**Anonymous**, Thursday, May 1, 2014 at 12:34pm
A pizza can be ordered with three choices of size (small, medium, or large), four choices of crust (thin, thick, crispy, or regular), and six choices of toppings (ground beef, sausage, pepperoni, bacon, mushrooms, or onions). How many different one-topping pizzas can be ordered?

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