F.5 Permutation&Combination3
2010-12-28 8:36 pm
There are 10 different yellow balls and 8 different red balls. If 6 of the balls are arranged in a row with at least 5 of them in red, how many different permutations are there?
回答 (1)
2010-12-28 9:23 pm
✔ 最佳答案
For the case of all 6 red balls, there are 8P6 possible permutations.For the case of 5 red + 1 yellow balls, there are 8C5 x 10 x 6! possible permutations.
Hence total no. of possible permutations = 423360
參考: 原創答案
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原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20101228000051KK00527