Hi All,

My apologies if this is a totally newbie question. 

I want to calculate the probability that a particular set of genes is picked 
repeatedly for 3 samplings. For example, if from a total of 'N' genes, I pick 
'A' number of genes in the first pick, 'B' number of genes in the second pick, 
and 'C' number of genes in the third pick, I would want to calculate p(n) where 
n = (A intersection B intersection C).

Would fisher exact test be the correct method to evaluate the probability? And 
if so how can I frame the 3x3 (?) contingency table? I can find numerous 
examples of 2x2 tables, but none for 3x3. Any guidance would be appreciated.

many thanks.


      
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