Hi,

Note: The probability of x successes in n trials is: 

P = nCx*  where p and q are the probabilities of success and failure respectively. 

In this case p = .09 q = .91   n = 6

nCx = 

P(exactly 2 out of 6 men...) = 6C2(.09)^2(.81)^4 = 15(.09)^2(.91)^4 = .0833 

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