Question

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.

Answer 1

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.

Answer 2

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