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Madison's teacher decided to have a pizza party and bought 5 boxes of pizzas for her 20 students. After Madison had gotten two slices, Madison's teacher told the class that the students who have had only one slice can come to the front of the line so they can have another slice.

Madison: 'Since I have had two slices already, I definitely won't be able to get another slice.'

What mistake did Madison make with this assumption?