Probability question... simple sampling.

Jul 2015
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For (B), I am getting 2/6... how did textbook come up with 4/7?
 
Jul 2015
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She has 6 friends in total.
Those at a restaurant with another of her friends are 2.
 
Jul 2015
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So the denominator just includes her at the restaurant now, okay. I see
 
Jul 2015
564
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Woops..understand now lmao