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oo oo I know this, the answer is the egg, I only know this because there was a documentary on Quarks & Co. a few weeks back here on German TV, however, as my German language skills are not 100% then I failed to fully understand the reasoning why.
The correct way to approach questions like this is to work out the sample space.
Scenario 1: One of a 2 child family is a girl, probabilty the other is a girl.
Sample space:
BG
GB
GG
the question is asking whats the probability of GG - the answer is 1/3
Scenario 2: The first of a 2 child family is a girl, probability the second is also a girl
Sample space:
GB
GG
Probability of GG is 1/2
Seems simple but not working out the sample space leads you to use your intuition and interestingly human intuition is crap in probabalistic situations.
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