You have 3 coins, one has heads on both sides, one has tails on both sides, and one is a normal coin. You put them in a bag and shake it. You draw one without looking and look at it in your hand. you see heads. AT THIS POINT what is the probability that you drew the double headed coin?
there are 2 possible answers for this:
1: 50% as you have 2 possible coins one is the double sided one the other has tails on the back, therefore 50%.
or
2. 2/3 as since it's heads you had a higher probability of it being the double headed one because it has 2 possible ways to draw heads.
I maintain that it's 50% as you had no possible way of knowing you were going to draw heads until you drew it therefore it was tottally random until you looked at it at which point there is 2 possible answers therefore 50%. It would not be 2/3 unless you TRIED TO DRAW HEADS, which is a complicated logical thought. what do you think?
2007-01-04
22:09:47
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15 answers
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asked by
Denair Cowboy
2
in
Mathematics