SOLUTION: Tim has 4 table tennis balls with small cracks. His friend accidentally mixed them in with 16 good balls. If Tim randomly picks 3 table tennis balls, what is the probability that a

Algebra ->  Probability-and-statistics -> SOLUTION: Tim has 4 table tennis balls with small cracks. His friend accidentally mixed them in with 16 good balls. If Tim randomly picks 3 table tennis balls, what is the probability that a      Log On


   

Question 440361: Tim has 4 table tennis balls with small cracks. His friend accidentally mixed them in with 16 good balls. If Tim randomly picks 3 table tennis balls, what is the probability that at least 1 is cracked?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

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