Combinaciones Cnk
Un k-subconjunto de elementos de n objetos distintos cuentan como una combinación, sin importar cómo permutes los elementos elegidos.
Cnk=k!(n−k)!n!,0≤k≤n.
Enlace a arreglos: Ank=Cnk⋅k! — primero elige el conjunto, luego pídelo en k![/math]]∗∗ways.∗∗Symmetry:∗∗∗∗[[math]]Cnk=Cnn−k.
Cn0=Cnn=1; Cn1=n
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