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math.permutations Calculator
Calculates permutations P(n,r) and combinations C(n,r) from n items choosing r, with and without replacement, showing factorials. The distinction between permutation (order matters) and combination (order doesn't) is the most important decision in counting problems.
Inputs
N
Reference formula or conversion factor shown for context.
R
Reference formula or conversion factor shown for context.
Repeated
Reference formula or conversion factor shown for context.
Circular
Reference formula or conversion factor shown for context.
Results
permutations P(n,r)
The value at the specified point or condition.
combinations C(n,r)
The value at the specified point or condition.
P/C ratio
The proportional relationship between two quantities.