Combinations Calculator
C(n,r) — order does not matter
Combinations count ways to choose items where order does not matter. Permutations count ways where order does matter. Both use factorials and appear in probability, statistics, and combinatorics.
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Fun Fact
There are C(52,5) = 2,598,960 possible 5-card poker hands from a standard deck, but only 4 are Royal Flushes — odds of 1 in 649,740.
References
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