Combinations with Repetition
Calculate Combinations with Repetition instantly with the exact formula and a worked example. Free online calculator — no signup, works on mobile.
Combinations with Repetition
n
r
C(n+r-1, r)
35
More about: Combinations with Repetition
What it calculates
The “Combinations with Repetition” calculator computes C(n+r-1, r) from 2 parameters: n, r.
A core calculation for studying, engineering tasks, and checking solutions.
Example calculation
With parameters n = 5, r = 3 the result is 35.
How to use
- Enter the parameter values — every field above is adjustable with a slider.
- The result and related metrics are calculated automatically as you type.
- Use the additional metrics shown (if any) where needed.
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