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# what kinda approach one must follow

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Manager
Joined: 01 Dec 2007
Posts: 52
what kinda approach one must follow [#permalink]

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08 Oct 2008, 22:07
what kinda approach one must follow?

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Director
Joined: 23 May 2008
Posts: 757
Re: cannot be factor of 3n+4 [#permalink]

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08 Oct 2008, 22:32
im not the best with number properties so i plugged in numbers

let n=12
3*12+4=40, this knocks out 4,5 and 8

let n=1
3*1+4=7, this knocks out 7

we are left with 6
Manager
Joined: 01 Dec 2007
Posts: 52
Re: cannot be factor of 3n+4 [#permalink]

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08 Oct 2008, 22:49
can someone explain it with alternative approach ?

Last edited by blover on 08 Oct 2008, 23:06, edited 1 time in total.
Manager
Joined: 22 Sep 2008
Posts: 119
Re: cannot be factor of 3n+4 [#permalink]

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08 Oct 2008, 23:00
n = 1 , 3n + 4 = 7 .. 7 is factor

n = 2 , 3n + 4 = 10 ..5 is factor

n = 4 , 3n + 4 = 16 ..4 is factor

n = 4 , 3n + 4 = 16 ..8 is factor

so only 6 remain.. and that will be answer.

even if you put negative integer you will get same kind of result.

I have other method but do not know how to explain which is very sort..

--== Message from GMAT Club Team ==--

This is not a quality discussion. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.
Re: cannot be factor of 3n+4   [#permalink] 08 Oct 2008, 23:00
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# what kinda approach one must follow

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