If the store in Exercise allows repetitions in the choices, show that there must be at least ten ways to make different choices that have the same cost.
Exercise
A store has an introductory sale on 12 types of candy bars. A customer may choose one bar of any five different types and will be charged no more than $1.75. Show that although different choices may cost different amounts, there must be at least two different ways to choose so that the cost will be the same for both choices.
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