(p+q+r)!/(p! × q ! × r!)
(p,q,r)=(3,3,0)
,
(p,q,r)=(2,2,1)
,
(p,q,r)=(1,1,2)
ou
(p,q,r)=(0,0,3)
.
6!/(3! × 3!)+5!/(2! × 2!)+ 4!/2!+1
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