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Slika - Shrani.si

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A. Juriˇ<strong>si</strong>ć in V. Batagelj: Verjetnostni račun in statistika 77<br />

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Permutacije<br />

Permutacija elementov 1, . . . , n je bijekcija, ki slika<br />

iz mnoˇzice {1, . . . , n} v mnoˇzico {1, . . . , n}.<br />

Npr. permutacija kart je običajno premeˇsanje kart<br />

(spremeni se vrstni red, karte pa ostanejo iste).<br />

ˇStevilo permutacij n elementov, tj. razvrstitev n-tih različnih<br />

elementov, je enako n! := 1 · 2 · . . . · n<br />

(oziroma definirano rekurzivno n!=(n−1)!n in 0!=1).<br />

Univerza v Ljubljani ▲<br />

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