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Pastimes : Time for anything Mental?
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To: FuzzFace who wrote (56)6/28/1997 4:54:00 PM
From: Michael Coley   of 69
 
RE: Jill and Jane's Children.

Edwin,

>> Jill and Jane each have two children.
>> Jill has at least one son.
>> Jane's eldest child is a boy.

>> Is it more likely that Jill has a daughter, or Jane, or is it equally likely?

It's more likely that Jill has a daughter.

Jane's eldest child is a boy, and there's a 50% chance that the youngest is a girl. With Jill, on the other hand, there are three equally likely outcomes: two boys, girl and older brother, girl and younger brother. That's a 67% chance that she has a daughter.

That's a whole lot easier than trying to figure out Pam's phone number! ;)

- Michael Coley
- i1.net
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