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Combinations

A combination involves selecting elements from a set in a situation where order does not matter. For example, there are 3 ways to select 2 elements of the set \( \{ 1, 2, 3\} \): \( \{1,2\}, \{1,3\}, \{2,3\} \).

In general, to choose \(k \) elements from a set with \(n\) members, we use the binomial coefficient \( {n \choose k} = \frac{n!}{k!(n-k)}! \).

Note by Arron Kau
2 years, 11 months ago

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