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Old 07-31-2007   #1
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Question probability problem

I cann't think out this problem.Please help me.ok?
There is a possible stop at every floor(floor 3,floor 2 and floor 1).Assume that any person is likely to get off at any floor and let X be the number of people that get off on the first floor.
(i)What values can X take on?
(ii)Find the probability for each possible value of X.
(iii) What is the expected number of people getting off on the first floor?
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