Which of the problems below could not be answered by using a factorial?
a. The number of ways 20 people can finish in the first three places in a race.
b. How many different kinds of pizzas can be made with 12 optional toppings.
c. How many ways 15 people can arrange themselves in a straight line.
d. How many ways the top 20 hit songs can be arranged from a selection of 500 current single.
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