Question 468918
From a group of 9 people, you randomly select 4 of them. 
What is the probability that they are the 4 oldest people in the group? 
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There is only 1 group of the 4 oldest.
There are 9C4 = (9*8*7*6)/(1*2*3*4) = 126 groups
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P(select the 4 oldest) = 1/126
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Cheers,
Stan H.