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Having sisters


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12 replies to this topic

#1 BMAD

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Posted 10 November 2013 - 05:51 PM

Do men have more sisters then women?


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#2 harey

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Posted 10 November 2013 - 11:47 PM

Spoiler for


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#3 Prime

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Posted 11 November 2013 - 10:05 PM

Spoiler for

Edited by Prime, 11 November 2013 - 10:08 PM.

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Past prime, actually.


#4 DeGe

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Posted 11 November 2013 - 11:46 PM

Spoiler for I think

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#5 phaze

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Posted 12 November 2013 - 12:08 AM

@DeGe I think you got caught in his cleverly designed trap

 

Spoiler for For a family of three


Edited by phaze, 12 November 2013 - 12:09 AM.

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Perfecting Mafia suicide since August 2008

#6 harey

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Posted 12 November 2013 - 09:24 AM

@bmad: I do not think my answer was the best one - after all, the chances were 50-50 ;)

 

phaze answered much better, he explained WHY.


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#7 BMAD

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Posted 12 November 2013 - 01:15 PM

Fair enough :D
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#8 phaze

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Posted 13 November 2013 - 12:55 AM

I think it is still up for grabs, as I have not proven anything but simply given an single example.

 

The prize should go to anyone who can come up with an explanation for families of arbitrary sizes rather than of size 3 

 

Hint: Pascal triangle


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#9 Rainman

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Posted 13 November 2013 - 11:33 AM

Spoiler for simple proof

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#10 harey

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Posted 13 November 2013 - 06:49 PM

I think it is still up for grabs, as I have not proven anything but simply given an single example.

Myself, I would prove it for N=0 and leave the proof for N>0 to the reader ;) If you try for some N, you quickly see the law.


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