14.Suppose you place 5 coins at random on squares of a 5 \x02 5 grid (so there are 25 squares),with no two coins permitted to occupy the same square.(a) What is the probability that no two coins are placed in the same row?(b) What is the probability

题目详情

14.Suppose you place 5 coins at random on squares of a 5 \x02 5 grid (so there are 25 squares),
with no two coins permitted to occupy the same square.
(a) What is the probability that no two coins are placed in the same row?
(b) What is the probability that no two coins are placed in the same row,and no two
coins are placed in the same column?

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答案和解析

no two coins in the same square：C(25,5)
each row one coin：5^5
no same row or column,：5!

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