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The function f is defined for all positive integers n by the

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Joined: 31 Dec 1969
Location: Russian Federation
Concentration: Technology, Entrepreneurship
GMAT 1: 710 Q49 V0
GMAT 2: 700 Q V
GMAT 3: 740 Q40 V50
GMAT 4: 700 Q48 V38
GMAT 5: 710 Q45 V41
GMAT 6: 680 Q47 V36
GMAT 7: Q42 V44
GMAT 8: Q42 V44
GMAT 9: 740 Q49 V42
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GMAT 11: 500 Q47 V33
GMAT 12: 670 Q V
GMAT 13: 680 Q V
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The function f is defined for all positive integers n by the [#permalink]

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New post 18 May 2008, 11:06
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

2. The function f is defined for all positive integers n by the following rule: f(n) is the number of positive integers each of which is less than n and has no positive factor in common with n other than 1. If p is any prime number than f(p) =

a) p-1
b) p-2
c) p+1/2
d) p-1/2
e) 2
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Re: GMATPrep 2 - function problem [#permalink]

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New post 18 May 2008, 15:32
the statement is saying that F(5) is the number of positive integers each of which is less than 5

so you have F(5) = 4

(1, 2, 3, 4) four numbers
Joined: 31 Dec 1969
Location: Russian Federation
Concentration: Technology, Entrepreneurship
GMAT 1: 710 Q49 V0
GMAT 2: 700 Q V
GMAT 3: 740 Q40 V50
GMAT 4: 700 Q48 V38
GMAT 5: 710 Q45 V41
GMAT 6: 680 Q47 V36
GMAT 7: Q42 V44
GMAT 8: Q42 V44
GMAT 9: 740 Q49 V42
GMAT 10: 740 Q V
GMAT 11: 500 Q47 V33
GMAT 12: 670 Q V
GMAT 13: 680 Q V
WE: Supply Chain Management (Energy and Utilities)
Followers: 0

Kudos [?]: 208 [0], given: 103073

Re: GMATPrep 2 - function problem [#permalink]

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New post 19 May 2008, 01:57
I see... I was reading it as if the integers also had to be prime factors which was where I was confused. Thank you.
Re: GMATPrep 2 - function problem   [#permalink] 19 May 2008, 01:57
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The function f is defined for all positive integers n by the

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