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#1 Re: Help Me ! » probability question help me » 2013-03-23 23:13:58
I am trying to understand the logic behind the terms that's all.
Summation from j= 0 to n of (-1)^j/j! in the numerator is not getting into my head.
As far as my understanding goes, it computes the number of ways you can give out n names to n people without any of them having their own name.
Why do we need to multiply the summation in the numerator with P(no one getting drunk)?
#2 Re: Help Me ! » probability question help me » 2013-03-23 21:42:28
and why did we have to time that by (k-1)!?
#3 Re: Help Me ! » probability question help me » 2013-03-23 21:41:22
That is quite okay, thank you.
Although I do not understand the 2nd summation in the numerator. What does it compute? the probability that n people (who are gonna get drunk) don't have each other's name?
#4 Re: Help Me ! » probability question help me » 2013-03-23 21:22:28
Oh yes please. Thank you 
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#5 Re: Help Me ! » probability question help me » 2013-03-23 20:55:58
Hi, sorry for bothering again, but what is j in this case?
#6 Re: Help Me ! » probability question help me » 2013-03-23 20:35:20
I think there's a gamma distribution in there? Unfortunately I haven't learned that yet. Would be okay if you rewrite the formula without the gamma distribution? thank you very much. 
#7 Re: Help Me ! » probability question help me » 2013-03-23 20:17:51
Hi;
If possible, can you please write this in a simplier format? as I don't quite understand these notations. Thank you very much.
#8 Re: Help Me ! » probability question help me » 2013-03-23 20:14:54
Hi, would you be able to show me the working for b, for the general formula of expected number of drunk please? thank you very much .
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