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 = .15 and q = .85

nCx = 



P( at least one) = 1 - P(catching none) = 1 - (.85)^3 = 1 - .614 = .386 

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