And lo On Wed, 17 Dec 2008 17:08:21 -0000, Phil Cook v2  
<phi### [at] nospamrocainfreeservecouk> did spake thusly:

> And lo On Wed, 17 Dec 2008 13:49:38 -0000, scott <sco### [at] scottcom> did  
> spake thusly:
>
>> If you have a box with N balls numbered 1 to N, and you repeatedly pull  
>> one out at random (replacing it each time), on average how many times  
>> would you expect to pull out a ball until you have seen all the balls 1  
>> to N?
>
> Do a search for Coupon Collector's Problem. For equal random drawings  
> it's roughly nHn that is n * Sum k=1-n of 1/k multiplied by n


Brain death! - n * Sum k=1-n of 1/k


-- 
Phil Cook

--
I once tried to be apathetic, but I just couldn't be bothered
http://flipc.blogspot.com

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