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Modules & Special Operations #10

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Senior Manager
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Joined: 10 Dec 2008
Posts: 483
Location: United States
GMAT 1: 760 Q49 V44
GPA: 3.9
Followers: 34

Kudos [?]: 146 [0], given: 12

Modules & Special Operations #10 [#permalink] New post 04 Aug 2009, 17:34
If \(x\) is a positive integer, \(f(x)\) is defined as the number of positive integers which are less than \(x\) and do not have a common factor with \(x\) other than 1. If \(x\) is prime, then \(f(x) = ?\)

(C) 2008 GMAT Club - Modules and Special operations#10

* \(x - 2\)
* \(x - 1\)
* \(\frac{x + 1}{2}\)
* \(\frac{x - 1}{2}\)
* 2

[Reveal] Spoiler:
OA is B?


I think the OA is wrong. Can someone verify?
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Re: Modules & Special Operations #10 [#permalink] New post 04 Aug 2009, 17:56
Expert's post
See this discussion please:
m23-69482.html
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Re: Modules & Special Operations #10   [#permalink] 04 Aug 2009, 17:56
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Modules & Special Operations #10

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