Hi

Tim has 4 table tennis balls with small cracks. 

His friend accidentally mixed them in with 16 good balls. 

 20 balls in all.  Tim randomly picks 3 table tennis balls

 P(at least one is cracked) = 1 - P(none cracked)

                              1  - 16/20*15/19*14/18 

                              1 - .4912

 P(at least one is cracked) = .5088 

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