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UBA - CienciaS • Ver Tema - Ejercicio 2 - Combinatoria - Primer parcial 22/05/10
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 Asunto: Ejercicio 2 - Combinatoria - Primer parcial 22/05/10
NotaPublicado: 22 May 2010, 21:05 
Vago

Registrado: 02 May 2009, 10:48
Mensajes: 7
Hola gente llegue hace unr ato de rendir y subo uno de los ejercicios a ver si esta bien lo que hice o si es un desastre atomico xD...

Ejercicio 2: ¿Cuantos numeros de 7 digitos hay que sean simultaneamente multiplos de 5 y 8?



Espero que este bien :)


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 Asunto: Re: Ejercicio 2 - Combinatoria - Primer parcial 22/05/10
NotaPublicado: 23 May 2010, 12:44 
Estudiante
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Registrado: 01 Feb 2010, 14:24
Mensajes: 23
En mi tema decía que los números NO se podían repetir, ergo, overcounting...


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 Asunto: Re: Ejercicio 2 - Combinatoria - Primer parcial 22/05/10
NotaPublicado: 26 May 2010, 18:56 
Estudiante

Registrado: 17 May 2010, 17:24
Mensajes: 27
Claro.
Ademas para que un número sea divisible por 8 es necesario que las tres últimas cifras sean divisibles por 8: o sea un número que termina en 40 no siempre es divisible por 8, ejemplo: 3247540 no es divisible por 8.
Y dentro de los casos que pusiste, la consigna decía que no podían repetirse los dígitos, o sea que no tendras los casos que terminan en: 000, 880, 800, 600, 440 y demás.



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 Asunto: Re: Ejercicio 2 - Combinatoria - Primer parcial 22/05/10
NotaPublicado: 26 May 2010, 22:12 
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Registrado: 29 Mar 2010, 23:16
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¿Cuántos números de 7 dígitos distintos son divisibles por 8 y 5?



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 Asunto: Re: Ejercicio 2 - Combinatoria - Primer parcial 22/05/10
NotaPublicado: 29 May 2010, 14:42 
Estudiante

Registrado: 17 May 2010, 17:24
Mensajes: 27
En mi tema se pedían numeros de 8 cifras distintas.

Dos posibles resoluciones estan en:

viewtopic.php?f=15&t=1992



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