SOLUTION: A costume store sells 20 costumes, you and 3 friends go to the store separately. What is the probability that at least 2 of you pick the same costume ?
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Question 429454: A costume store sells 20 costumes, you and 3 friends go to the store separately. What is the probability that at least 2 of you pick the same costume ?
Answer by edjones(8007) (Show Source): You can put this solution on YOUR website!
20/20 * 19/20 * 18/20 * 17/20 = .72675 Probability noone picks the same costume.
1-.72675=.27325 probability that at least 2 of you pick the same costume.
.
Ed
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