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

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Basic Math

Five people on thebasement of a building get on an elevator that stops at sevenfloors. Assuming that each has an equal probability of going to anyfloor, find

(a) the probabilitythat they all get off at different floors; (3 POINTS)

(b) the probabilitythat two people get off at the same floor and all others get off atdifferent floors. (4 POINTS)

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