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# Modules & Special Operations #10

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Author Message
Senior Manager
Joined: 10 Dec 2008
Posts: 483
Location: United States
GMAT 1: 760 Q49 V44
GPA: 3.9
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Kudos [?]: 152 [0], given: 12

Modules & Special Operations #10 [#permalink]  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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Founder
Affiliations: AS - Gold, HH-Diamond
Joined: 04 Dec 2002
Posts: 13021
Location: United States (WA)
GMAT 1: 750 Q49 V42
GPA: 3.5
Followers: 2918

Kudos [?]: 15188 [0], given: 3939

Re: Modules & Special Operations #10 [#permalink]  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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