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[SPAM] [obm-l] Probabilidade

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Problema de combinat=F3ria II                                        
         
                               Escrevem-se em um quadro negro os primeiro=
s  2007 n=FAmeros naturais: 1, 2, 3, ..., 2007. A frente de cada um se es=
creve o sinal + ou - de forma ordenada, da esquerda para direita. Para de=
cidir cada sinal =E9 jogada uma moeda: se sai cara escreve- se + (mais), =
se sai coroa escreve -se - (menos). Uma vez escritos os 2007 sinais efetu=
a - se a soma da express=E3o resultante. Determinar a probabilidade de qu=
e o resultado seja 0.

                           Sauda=E7=F5es,   

                                           Fernando

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<DIV >
<DIV>
<P class=3DMsoNormal><SPAN ><FONT size=3D3>Problema de combinat=F3ria II&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;</P>
<P class=3DMsoNormal><FONT face=3D"Times New Roman">&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT></P>
<P class=3DMsoNormal><FONT face=3D"Times New Roman">&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp; Escrevem-se em um quadro negro os primeiros&nbsp;&nbsp;2007=
&nbsp;n=FAmeros naturais: 1, 2, 3, ..., <st1:metricconverter w:st=3D"on" =
ProductID=3D"2007. A">2007. A</st1:metricconverter> frente de cada um se =
escreve o sinal + ou - de forma ordenada, da esquerda para direita. Para =
decidir cada sinal =E9 jogada uma moeda: se sai cara&nbsp;escreve- se&nbs=
p;+ (mais), se sai coroa escreve -se - (menos). Uma vez escritos os 2007 =
sinais&nbsp;efetua - se&nbsp;a soma da express=E3o resultante. Determinar=
 a probabilidade de que o resultado seja 0.</FONT></P>
<P class=3DMsoNormal><FONT face=3D"Times New Roman"></FONT>&nbsp;</P>
<P class=3DMsoNormal><FONT face=3D"Times New Roman">&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Sauda=E7=F5=
es,&nbsp;&nbsp; </FONT></P>
<P class=3DMsoNormal><FONT face=3D"Times New Roman"></FONT>&nbsp;</P>
<P class=3DMsoNormal><FONT face=3D"Times New Roman">&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp; Fernando</FONT></P></FONT></SPAN></DIV></DIV>

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