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# A company assign a unique 3 digit telephone extension to

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Manager
Joined: 25 Feb 2008
Posts: 54
Followers: 0

Kudos [?]: 9 [0], given: 0

A company assign a unique 3 digit telephone extension to [#permalink]  11 Mar 2008, 07:07
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.

thanks
Director
Joined: 01 Jan 2008
Posts: 629
Followers: 3

Kudos [?]: 140 [0], given: 1

Re: A unique three digit [#permalink]  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.

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
Joined: 22 Oct 2006
Posts: 1443
Schools: Chicago Booth '11
Followers: 8

Kudos [?]: 156 [0], given: 12

Re: A unique three digit [#permalink]  11 Mar 2008, 08:32
A

definitely not a good GMAT question
SVP
Joined: 28 Dec 2005
Posts: 1579
Followers: 2

Kudos [?]: 91 [0], given: 2

Re: A unique three digit [#permalink]  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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