Five people on the basement of a building get on an elevator
that stops at seven...
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Five people on the basement of a building get on an elevatorthat stops at seven floors. Assuming that each has an equalprobability of going to any floor, find
(a) the probability that they all get off at differentfloors
(b) the probability that two people get off at the same floorand all others get off at different floors.
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