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A capital P with two subscripts, counting ordered arrangements.
Also known as: nPr, Permutations, Arrangement count
Permutation notation counts arrangements where order matters, as combination notation counts selections where it does not. The two are constantly swapped, and the difference is a factor equal to the factorial of the number chosen.
Counts the number of ordered arrangements of a given size drawn from a larger collection.
Contexts: Mathematics
Differs from the combination count by a factor equal to the factorial of the number chosen, which is exactly the number of orderings of each selection.
Contexts: Mathematics
Is written with the two arguments in different positions by different conventions and calculator makers, so the order must be checked.
Contexts: Mathematics
A capital letter with a rounded bowl on an upright stem, carrying small numerals set before and after it at the foot.
One counts ordered arrangements, the other unordered selections.