Re: Can you help?

Duncan Chiu (
Thu, 17 Apr 1997 17:13:20 -0400 wrote:
> A friend of mine gave me the following question. Ihope that you can give
> the answer.
> A jar contains one organ either a brain or a heart. An Alien puts a brain in
> the jar. He then pulls out a brain. What`s the probability that the jar
> originally contained a brain. I think that this is the "LETS MAKE A DEAL"
> problem and I feel that the answer is 2/3 but then sometimes I think it is
> 3/4?

It is 1/2. A no brain problem?