Fakitoriyari, Mapemiyuteshoni, Makombineshoni

4!=1×2×3×4\displaystyle 4! = 1 \times 2 \times 3 \times 4, sezvinoratidzwa nesiraidhi. 2nd F na 4 ndiyo fakitoriyari. Nyorai 4, dzvanyai second F, fakitoriyari, uye zvakaenzana: 24.. 2nd F na 6 inoverenga mapemiyuteshoni. Nyorai 10, dzvanyai second F, n P r, nyorai 3, uye dzvanyai zvakaenzana: 720.. 2nd F na 5 inoverenga makombineshoni. Nyorai 5, dzvanyai second F, n C r, nyorai 2, uye dzvanyai zvakaenzana: 10..