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Five people on the basement of a building get on an elevator that stops at seven...

Five people on the basement of a building get on an elevator that stops at seven floors. Assuming that each has an equal probability of going to any floor, find

(a) the probability that they all get off at different floors

(b) the probability that two people get off at the same floor and all others get off at different floors.

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milcah answered 1 year ago
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