Probability Mania riddle
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Jacob & John have two children. The probability that the first child is a girl is 50%. The probability that the second child is a girl is also 50%. Jacob & John tell you that they have a daughter.
What is the probability that their other child is also a girl? 
There are 4 possibilities: boy-boy, boy-girl, girl-boy an girl-girl.
When they say they have a girl we are left with 3 possibilities: boy-girl, girl-boy an girl-girl.
Only one of them has 2 girls so the probability that the other child is also a girl is 1/3.
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