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# M23 #35

Author Message
Intern
Joined: 29 Dec 2012
Posts: 17

Kudos [?]: 21 [0], given: 32

Re: If x is a positive integer, f(x) is defined [#permalink]

### Show Tags

13 Aug 2013, 00:36
Hi,

If x is prime for example x = 5,
then f(x) will consist of (2, 3, 4) or x-2 integers

Thus, (A)

Regards,

-------------------------------------------------------------

Thanks for the help. In GMAT Club tests solution the explanation was in correct, to cross check it , I posted this question.

In GMAT Club solution , B was correct answer which was incorrect.

Thanks for the help.

Kudos [?]: 21 [0], given: 32

Math Expert
Joined: 02 Sep 2009
Posts: 41886

Kudos [?]: 128670 [0], given: 12181

Re: If x is a positive integer, f(x) is defined [#permalink]

### Show Tags

13 Aug 2013, 01:20
schittuluri wrote:
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)=?

A)x−2
B)x−1
C)(x+1)2
D)(x−1)2
E)2

Merging similar topics.

_________________

Kudos [?]: 128670 [0], given: 12181

Math Expert
Joined: 02 Sep 2009
Posts: 41886

Kudos [?]: 128670 [0], given: 12181

Re: If x is a positive integer, f(x) is defined [#permalink]

### Show Tags

13 Aug 2013, 01:20
schittuluri wrote:
Hi,

If x is prime for example x = 5,
then f(x) will consist of (2, 3, 4) or x-2 integers

Thus, (A)

Regards,

-------------------------------------------------------------

Thanks for the help. In GMAT Club tests solution the explanation was in correct, to cross check it , I posted this question.

In GMAT Club solution , B was correct answer which was incorrect.

Thanks for the help.

The correct answer is B, not A.

Hope it helps.
_________________

Kudos [?]: 128670 [0], given: 12181

Re: If x is a positive integer, f(x) is defined   [#permalink] 13 Aug 2013, 01:20

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# M23 #35

Moderator: Bunuel

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