l********V
发帖数: 178 | 1 周末出个题给大家。100 passengers are boarding an airplane with 100 seats.
Everyone has a ticket with the seat number. Passengers board the airplane in
order. However, the first passenger looses his ticket so he takes a random
seat. For any subsequent passenger, he either sits on his own seat or, if
the seat is taken, takes a random empty seat. What's the probability that
the last passenger would sit on his own seat?
欢迎各抒已见。 | B******5
发帖数: 4676 | 2 经典的题目，当时记得是说George Bush的。
说他illiterate，上了空军一号随便坐一个位置，然后问题同上～ | K*****2
发帖数: 9308 | 3 1/2 ?
一共n个人，若k>=2, 第k个人坐不到自己座位的概率是1/(n-k+2). | h***i
发帖数: 3844 | 4 0.5
in
random
【在 l********V 的大作中提到】
: 周末出个题给大家。100 passengers are boarding an airplane with 100 seats.
: Everyone has a ticket with the seat number. Passengers board the airplane in
: order. However, the first passenger looses his ticket so he takes a random
: seat. For any subsequent passenger, he either sits on his own seat or, if
: the seat is taken, takes a random empty seat. What's the probability that
: the last passenger would sit on his own seat?
: 欢迎各抒已见。
| v********9
发帖数: 35 | 5 1/100
我的理解是100个人随便坐，那么第100个人正好坐在自己座位的多少？如果是这样，就
好比n个数的全排列，n在最后一位的概率是多少。在n!个全排列中， 每一个数在最后
一位出现的机会一样， 因此我认为是1/n.
仅供参考 | i***o
发帖数: 778 | |
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