My Math Forum Can anyone explain me the solution of this exercise please?

 April 30th, 2013, 01:17 AM #1 Newbie   Joined: Apr 2013 Posts: 9 Thanks: 0 Can anyone explain me the solution of this exercise please? Hi i've found this exercise but I do not understand the solution: __________________________________________________ _______________ In a party c candies are given randomly to n kids. ¿Which is the probablility that my nephew doesn't receive any candy? We supose the candies and the kids are numerated. Each of the candies can be given to any of the n kids, so there are n^c possible cases and the unfavorable ones for my nephew are all the manners to distribute the candies between the (n-1) remaining kids i.e. (n-1)^c. So the probability is (1-1/n)^c. If n=c the probability is practically independent of n, being aproximately equals to e^-1=0.37 __________________________________________________ _______________ First of all I think there's a mistake and the probability is (n-1/n)^c and not (1-1/n)^c. Then what's the meaning of "If n=c the probability is practically independent of n"? What does independent mean in this case? And how do we obtain e^-1? Thanks! If anyone know a book as "probability and statistics for dummies" please let me know! Thanks PS: I don't know if this topic fits here or in "High School Mathematics" so I've posted twice.
 April 30th, 2013, 05:01 AM #2 Global Moderator     Joined: Oct 2008 From: London, Ontario, Canada - The Forest City Posts: 7,958 Thanks: 1146 Math Focus: Elementary mathematics and beyond Re: Can anyone explain me the solution of this exercise plea Please do not post duplicate topics. Topics will be moved as necessary. I have deleted the other topic.

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