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Combination

math Maturity 11-13

You can pick a few things from a group.

Combinations without repetition; 5 choose 3.svg
Combinations without repetition; 5 choose 3.svg
It does not matter which one you pick first. You just keep the ones you want. This helps us see all the ways to choose. It is like picking fruit for a snack. Can you pick two fruits?

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File:Combinations with repetition; 5 multichoose 3.svg
Combinations with repetition; 5 multichoose 3.svg
File:Combinations without repetition; 5 choose 3.svg
Combinations without repetition; 5 choose 3.svg
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Stirling numbers of the second kind
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Concepts mentioned in this article

Tool Mathematics Game Matter Number

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More advanced topics to explore

Stirling numbers of the second kind Double counting (proof technique) Enumerative combinatorics Permutation

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Simpler topics to build understanding

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📚 Content adapted from Wikipedia | Readability: FK 9.5 | Vital Level 4