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is the positiv integer n a multiple of 24 1. n is a multiple

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Manager
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Joined: 24 Jul 2010
Posts: 92
Followers: 1

Kudos [?]: 15 [0], given: 12

is the positiv integer n a multiple of 24 1. n is a multiple [#permalink] New post 30 Nov 2010, 09:56
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E

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Question Stats:

9% (01:11) correct 90% (00:12) wrong based on 11 sessions
is the positiv integer n a multiple of 24
1. n is a multiple of 4
2. n is a multiple of 6
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Joined: 02 Sep 2009
Posts: 17335
Followers: 2876

Kudos [?]: 18425 [0], given: 2351

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Re: properties of numbers [#permalink] New post 30 Nov 2010, 10:01
Expert's post
whichscore wrote:
is the positiv integer n a multiple of 24
1. n is a multiple of 4
2. n is a multiple of 6


Probably the best way to solve this problem is to test different numbers.

(1) n is a multiple of 4 --> if n=4 then the answer is NO but if n=24 then the answer is YES. Not sufficient.
(2) n is a multiple of 6 --> if n=6 then the answer is NO but if n=24 then the answer is YES. Not sufficient.

(1)+(2) Well, n is obviously a multiple of LCM of 4 and 6, so n is a multiple of 12. Now, again if n=12 then the answer is NO but if n=24 then the answer is YES. Not sufficient.

Answer: E.
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Manager
Manager
Joined: 24 Jul 2010
Posts: 92
Followers: 1

Kudos [?]: 15 [0], given: 12

Re: properties of numbers [#permalink] New post 30 Nov 2010, 10:17
thx bunnel for the explanation !
Re: properties of numbers   [#permalink] 30 Nov 2010, 10:17
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