CASIO

Le misebenzi yenza kube lula ukwenza izimvume kanye nezibalo zokuhlanganiswa.

n no-r kanye kumele ibe yizinombolo ezigcwele eziphakathi kuka-0 ≦ r ≦ n < 1 × 1010.

Isibonelo 1: Ukunquma ukuthi mangaki amanani amadijithi angu-4 angahle akhiqizwe usebenzisa izinombolo 1 kuya ku-7

Izinombolo azikwazi ukuphinda ziphindwe ngaphakathi kwenani elifanayo lamadijithi angu-4 (1234 kuvunyelwe, kepha ayi-1123 ayikho).

• 7(nPr) 4
• 840.

Isibonelo 2: Ukunquma ukuthi zingaki amaqembu angu-4 ahlukene angalungiswa eqenjini labantu abangu-10

• 104
• 210.