proba que: C(n+2,r)=C(n,r)+2·C(n,r−1)+C(n,r−2)
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proba que: C(n+2,r)=C(n,r)+2·C(n,r−1)+C(n,r−2)
I wasn't able to parse your question, but the HE.NET team is hard at work making me smarter.