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Unformatted text preview: just the right level of detail for the Frst card. After you think youve got the answer, check that its close to 1/4. If you cant Fgure out why it should be close to 1/4 you should put your pencil away and simply think about what the problem is asking. 5. 1.4.10. 6. 1.Rev.10. In the second part two of the terms are straightforward (why?); and if you can Fnd three of the terms then the fourth is easy (why?); so theres really only one term that requires some care. It may help you to compare the following two events: all four people are of Type A or Type B exactly two types appear, and those are A and B. If these two events are not the same, then what is the dierence between them? Answering that may save you a lot of calculation....
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 Fall '07
 Hutchings

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