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Which of the problems below is not a permutation? The number of ways 20 people can finish in the first three places in a race. How many different kinds of pizzas can be made with 12 optional toppings. How many ways 15 people can arrange themselves in a straight line. How many ways the top 20 hit songs can be arranged from a selection of 500 current singles.

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the correct answer is the 12 topping pizza one. Just turned it in and got 100 on it. good luck

Permutation is defined as the possible combinations or variation in which a number of things can be ordered or arranged.    

All the examples provided are permutation, except -- How many different kinds of pizzas can be made with 12 optional toppings.  

Other examples are clear examples of permutations. With permutations, order matters.

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