A pizza parlor offers a choice of 16 different toppings. How many 2-topping pizzas are possible? Your answer is : Question Help: Video Submit Question
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Since the order of the toppings does not matter, we use the combination formula: $$C(n, k) = \frac{n!}{k!(n-k)!}$$ where n is the total number of items and k is the number of items to choose. Show more…
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