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Capthan
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A company assign a unique 3 digit telephone extension to 11 Mar 2008, 08:07
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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



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maratikus
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A company assign a unique 3 digit telephone extension to 11 Mar 2008, 08:23
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Capthan
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
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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
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terp26
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A company assign a unique 3 digit telephone extension to 11 Mar 2008, 09:32
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A

definitely not a good GMAT question
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pmenon
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A company assign a unique 3 digit telephone extension to 11 Mar 2008, 10:55
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didnt like this question, but get A.

7X10X10 = 700

B doesnt tell us much other than that we cant use 9



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