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# Modules & Special Operations #10

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Senior Manager
Joined: 11 Dec 2008
Posts: 459
Location: United States
GMAT 1: 760 Q49 V44
GPA: 3.9
Modules & Special Operations #10 [#permalink]

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04 Aug 2009, 18:34
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

OA is B?

I think the OA is wrong. Can someone verify?
Founder
Joined: 04 Dec 2002
Posts: 17054
Location: United States (WA)
GMAT 1: 750 Q49 V42
Re: Modules & Special Operations #10 [#permalink]

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04 Aug 2009, 18:56
m23-69482.html
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Re: Modules & Special Operations #10   [#permalink] 04 Aug 2009, 18:56
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# Modules & Special Operations #10

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