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A diner makes burgers, each with 2 out of the 4 toppings the diner offers. How many possible combinations of toppings are there?
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. Then the combinations formula is 
. Here, n = 4 and k = 2. So 
. (Alternatively, the numbers are low enough that we could simply count. If we have toppings a, b, c, and d, the possible combos are: ab, ac, ad, bc, bd, and cd.)