10 people are to be divided into 3 committees, in such a way that every committee must have at least one member, and no person can serve on all three committees. In how many ways can this be done? generalise this to n people.
locking this thread being a repition of the same question by same id.......
If anyone wants to give answer of this question, please refer to http://www.goiit.com/posts/list/algebra-1-more-1148247.htm
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