Thursday, July 22, 2010

If my friend shows me 3 cards, and I pick 1, what are the chances that...?

my friend showed me 3 cards, face down, and 2 were jacks and 1 was an ace--i had to try and pick the 1 ace. so i picked my card, then he showed me one of the other cards (that i didnt pick) that was a jack, so now there are 2 cards face down still, one of them being my original pick. then he asked me if i wanted to switch cards, and so i did, but after i switched cards--what are the chances of me having the ace after the switch?
This is the famous

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