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probability question in my gmat

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Joined: 24 Sep 2011
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probability question in my gmat [#permalink]

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New post 03 Oct 2011, 01:17
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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Manager
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Joined: 03 Mar 2011
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Location: United States
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GMAT 1: 730 Q51 V37
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Re: probability question in my gmat [#permalink]

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New post 03 Oct 2011, 01:24
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]

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New post 03 Oct 2011, 01:27
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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Manager
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Location: United States
Schools: Erasmus (S)
GMAT 1: 730 Q51 V37
GPA: 3.9
Re: probability question in my gmat [#permalink]

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New post 03 Oct 2011, 01:31
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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, 01:31
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