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**<math>n</math> is the number of items.
**<math>n</math> is the number of items.
**<math>r</math> is the number of items in each arrangement.
**<math>r</math> is the number of items in each arrangement.
{{#ev:youtube|4AQx4Hnctcw|200|right|Combination}}
==Examples==
==Examples==