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Modules & Special Operations #10

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Senior Manager
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Joined: 10 Dec 2008
Posts: 484
Location: United States
GMAT 1: 760 Q49 V44
GPA: 3.9
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Kudos [?]: 121 [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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Kudos [?]: 9414 [0], given: 3699

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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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