ncr and npr
2010-12-11 7:47 pm
In an assembly of 100 persons,15 are englishmen.In how many ways can a committee of 5 persons be formed so as to include at least 1 englishmen?
回答 (1)
2010-12-11 7:57 pm
✔ 最佳答案
Number of ways to choose 5 persons from among 100 without restriction = 100C5 = 75287520 waysNumber of ways to choose only non-englishmen= 85C5 = 32801517 waysNumber of ways to choose at least 1 englishmen= 75287520 – 32801517 = 42486003 ways
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原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20101211000051KK00454