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 April 2nd, 2009, 03:34 PM #1 Newbie   Joined: Feb 2009 Posts: 8 Thanks: 0 how calculate 8C2 ? is a combination ;P - one marble is randomly drawn, and then NOT REPLACED, from a jar containing two white marbles and one black marble. A second marble is drawn. what is the probability of drawing a white one and then black one ? explain pls because idk how to explain
 April 2nd, 2009, 03:52 PM #2 Global Moderator   Joined: May 2007 Posts: 6,730 Thanks: 689 Re: how calculate Prob of drawing white marble first is 2/3. In that case you have one white and one black left so prob. of drawing black is 1/2. So prob. of both together is 1/3.
 April 2nd, 2009, 04:01 PM #3 Newbie   Joined: Feb 2009 Posts: 8 Thanks: 0 Re: how calculate thnks .. 8 combination 2 ?
 April 2nd, 2009, 10:03 PM #4 Global Moderator   Joined: Dec 2006 Posts: 20,474 Thanks: 2039 Use a Google search to find out how to calculate 8C2. You are not given enough information to allow the probability question to be answered. The answer mathman gave relied on a significant unstated assumption; can you identify what that assumption was?

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