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probability question in my gmat

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probability question in my gmat [#permalink] New post 03 Oct 2011, 00:17
a company has 8 telephone lines . if 4 telephones lines have to b made by company .what is the probability that they are each made on different line?
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Re: probability question in my gmat [#permalink] New post 03 Oct 2011, 00:24
I do not understand what does it mean "4 telephones lines have to be made by company"
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Re: probability question in my gmat [#permalink] New post 03 Oct 2011, 00:27
bagrettin wrote:
I do not understand what does it mean "4 telephones lines have to be made by company"


It's "calls" I guess.
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Re: probability question in my gmat [#permalink] New post 03 Oct 2011, 00:31
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8/8*7/8*6/8*5/8=210/8^3=105/256
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Re: probability question in my gmat   [#permalink] 03 Oct 2011, 00:31
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