Pair problem
Level
2
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
1/20C2
1/20C20
1/40C20
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1 solution
P(E)= 4 0 C 2 0 2 0 C 2 0