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Re: [obm-l] fatoriais

To: <obm-l@xxxxxxxxxxxxxx>
Subject: Re: [obm-l] fatoriais
From: "Ariosto" <arconcher@xxxxxxxxxxxxx>
Date: Mon, 30 Dec 2002 09:50:13 -0200
References: <36.352267c5.2b413ed0@aol.com>
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Sender: owner-obm-l@xxxxxxxxxxxxxxxxxxxxx

(n - r + 1)! = (n - r + 1)(n - r )(n - r - 1)!

----- Original Message -----

From: Faelccmm@aol.com

To: obm-l@mat.puc-rio.br

Sent: Monday, December 30, 2002 4:16 AM

Subject: [obm-l] fatoriais

Uma questão da PUC:
(n-r+1)!/(n-r-1)! obtêm-se:

A resposta é (n-r)(n-r+1), mas como chegar neste resultado?

References:
- [obm-l] fatoriais
  - From: Faelccmm

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