you would like to build-your own burger at a fast-food restaurent there are 9 different breads five different cheeses three different cold toppings and three different sauces on the menu if you want to include one choice from each of ingredient categories how many different burger can you build
Total available different breads = 9
Total available different Cheeses = 5
Total available different cold toppings = 3
Total available different sauces = 3
If we want to include one choice from each available ingredient categories , total different burger we can build using the fundamental rule of counting = total available breads * Total available different Cheeses * Total available different cold toppings * Total available different sauces
Total different burgers which can be build with above categories = 9 * 5 * 3 * 3 = 405
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