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A company assign a unique 3 digit telephone extension to

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Manager
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A company assign a unique 3 digit telephone extension to [#permalink]

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New post 11 Mar 2008, 07:07
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

A company assign a unique 3 digit telephone extension to each of its employees. What is the maximum number of employees of the company's telephone sustem will accomodate?

1) the first digit of each extension is restricted to the 2 through 8, there are no restriction on the second and third digit.
2) the digit 9 is used to access an outside telephone line.


Please explain ur answer.

thanks
Director
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Re: A unique three digit [#permalink]

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New post 11 Mar 2008, 07:23
Capthan wrote:
A company assign a unique 3 digit telephone extension to each of its employees. What is the maximum number of employees of the company's telephone sustem will accomodate?

1) the first digit of each extension is restricted to the 2 through 8, there are no restriction on the second and third digit.
2) the digit 9 is used to access an outside telephone line.


Please explain ur answer.

thanks


I don't see relevance of condition 2 since the first digit can not be equal to 9 anyway.
first digit: 7 options, second digit 10 options, third digit 10 options -> 700 employees
VP
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Re: A unique three digit [#permalink]

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New post 11 Mar 2008, 08:32
A

definitely not a good GMAT question
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Re: A unique three digit [#permalink]

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New post 11 Mar 2008, 09:55
didnt like this question, but get A.

7X10X10 = 700

B doesnt tell us much other than that we cant use 9
Re: A unique three digit   [#permalink] 11 Mar 2008, 09:55
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A company assign a unique 3 digit telephone extension to

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