SOLUTION: if 20 men go to a hospital in a room entering before entering they have been asked to off their shoes can enter after returning the shoes keeper throw them their pairs (all pairs i
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Question 1100901: if 20 men go to a hospital in a room entering before entering they have been asked to off their shoes can enter after returning the shoes keeper throw them their pairs (all pairs in one throw) randomly find the probability that 20 men received their own pair
Answer by ikleyn(52833) (Show Source): You can put this solution on YOUR website!
.
20! possible permutations of 20 pairs (each pair is considered as NON-SEPARATED item).
Only ONE permutation is happy.
The probability under the question is .
I just solved this problem 3-4-5 days before.
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