Count arrangements (nPr) and selections (nCr) with or without repetition, plus circular and repeated-element permutations.
nPr, nCr, with repetition, circular arrangements and more.
Results shown in full and scientific notation for huge values.
Every calculation displays the exact formula and expansion.
Useful for probability, lottery odds, seating and passwords.
Pair combinatorics with ratios, fractions and statistics.