Ben Doom wrote:
>
> If I'm thinking straight, you're getting close.  The first card, since 
> we only care about the 10 correct ones, has a chance of 10/20.
>
> The second has a chance of 9/19 -- because we've removed one correct card.
> 
> So, if I'm right and not as befuddled as I commonly am, you end up with 
> something like 0.016253869969.....

You are correct.

Jochem

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