作者mqazz1 (无法显示)
看板Math
标题[离散] 丢骰子
时间Sat Apr 2 20:29:26 2011
a fair die is tossed four times in succession
find the probability that the four resulting numbers form a nondecreasing
sequence
请问这题要怎麽解呢?
谢谢
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1F：→ privatewind :请求出 1<=x1<=x2<=x3<=x4<=x5<=x6<=6 整数解个数... 04/02 22:51
2F：→ vandermonde :不是只有丢四次吗 所以应该是只有四个吧?1<=X1~X4<=6 04/02 23:10