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(red)& q = .4

nCx =   n = 4

P(3 or 4 red) = P(3red) + P(4red) = 4(.6)^4*.4 + (.6)^4 = .4752 

sry, did not read it properly: 

 47.52% of the  samples contain at least 3 red.

 

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