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Exercise 4

Avg difficulty 2.5

Okay, that's overkill. A kid only has two hands, after all, so handling nine accessories would be a dextrous challenge. Let's say instead that a child can choose up to three accessories (but must have at least one). Now how many costume choices are there?

Davies, A Cool Brisk Walk Through Discrete Mathematics, Counting, Exercise 4

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Adapted from A Cool Brisk Walk Through Discrete Mathematics © 2023 Stephen Davies. Licensed under CC BY-SA 4.0. Source: A Cool Brisk Walk Through Discrete Mathematics. Imported at revision 4b9934b.