Warp wrote:

>   You are thinking it in the wrong way.
> 
>   The very first time you select one ball, the probability it's a ball you
> have never seen before is 1.
> 
>   The second time you select a ball, the probability it's a ball you have
> never seen before is (N-1)/N.
> 
>   With the third ball, the probability is (N-2)/N. And so on.

As with most mathematical problems, it's trivially easy once you already 
know what the answer is... :-}

(And let's not forget, I have the lowest IQ in this newsgroup...)

-- 
http://blog.orphi.me.uk/
http://www.zazzle.com/MathematicalOrchid*

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