• anonymous
A bookshelf contains six mysteries and three biographies. Two books are selected at random without replacement. What is the probability that both books are mysteries?
  • jamiebookeater
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  • anonymous
P(2 mystery) = 6C2/9C2 = 15/36 = 5/12 If I deserve medal then give me one
  • amistre64
there is a total of: 9! ---- ways of choosing the books 2!7! 9.8 --- = 9.4 = 36 ways total 2 If we take away the bios and see how many ways there are of picking 2 out of 6 we get: 6! 6.5 ---- = --- = 3.5 = 15 ways to get only 2 mysts. 2!4! 2 15/36 = .41666... the probablity of pick 2 mysts is then; 41' 2/3% right?

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