Statistics
Combinations with Repetition Calculator
Count combinations when repetition is allowed.
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When you can pick the same item more than once, use combinations with repetition.
The math behind it
The count is C(n + r - 1, r), the 'stars and bars' formula.
Worked Example
Choosing 3 from 5 with repetition gives 35.Frequently Asked Questions
When does repetition apply?
When items can be selected multiple times, like scoops of ice cream flavors.
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