On 4 May 2010 at 16:18, Owen Densmore wrote:

> My probability is failing me.  Could someone answer this?
> 
> I have a very biased coin that comes up 2/3 heads, 1/3 tails.  I want  
> to do an experiment of n coin flips.
> 
> The probability that all are heads is (2/3)^n, right?
> 
> What I'm interested is the related question:  Lets suppose I repeat  
> the experiment t times.  How likely am I to get all heads once in a  
> series of t sets of n flips?
 
Exactly once, or at least once?

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