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 = 6/50 = .12 & q .88

nCx = 

4 coins picked: n = 4

 P(at least one Canadian) = 1-P(no Canadian)

                          = 1 -.88^4

                          = .4003 

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