Combinação simples.
C(n,p)=n!/(n-p)!p!
C(12,9)=12!/(12-9)!9!
C(12,9)=12!/3!9!
C(12,9)=12×11×10×9!/3!9!
C(12,9)=12×11×10/3×2×1
C(12,9)=1320/6
C(12,9)=220
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Combinação simples.
C(n,p)=n!/(n-p)!p!
C(12,9)=12!/(12-9)!9!
C(12,9)=12!/3!9!
C(12,9)=12×11×10×9!/3!9!
C(12,9)=12×11×10/3×2×1
C(12,9)=1320/6
C(12,9)=220
Att;Guilherme Lima