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April 2nd, 2009, 03:34 PM   #1
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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
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April 2nd, 2009, 03:52 PM   #2
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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.
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April 2nd, 2009, 04:01 PM   #3
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Re: how calculate

thnks ..

8 combination 2 ?
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April 2nd, 2009, 10:03 PM   #4
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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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