1.if 10 married couples are randomly seated at a round table
computed the expected number of the number of wives who are
seated next to their husbands
2.Draw 15 cards at random and without replacement from a pack
of 25 cards numbered 1、2、3......25 Find the probability that
13 is the median of the cards selected.
3.X and Y are selected at random from the interval (0,1) if these values
are uniformly and independently distributed
Evaluate the probability that the three resulting line segments, by
cutting the interval at the numbers, can form a triangle.
這3題希望大家幫我解答!! 拜托大家了!!!
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