Respuesta :

Ettrak
P(n,r)= n! /(n-r)! 
C(n,r)= n! / r! (n-r)! 
P^c(n,r)= P raised to power C(n.r)? (If so, you know C(n,r) ; raise P to power C(n,r)) 
P(A/B) = P(A ∩ B) / P(B)
Hope this helped :)