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Is X a prime integer?

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Is X a prime integer? [#permalink] New post 01 Apr 2010, 06:16
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A
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C
D
E

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Question Stats:

59% (02:16) correct 41% (01:01) wrong based on 66 sessions
Is X a prime integer?

(1) x! is not divisible by 5
(2) |x|! is divisible by 6

Sorry to open a new thread:
gmat-diagnostic-test-question-79332.html

The answer is C.
Doesnt 3 and 4 both satisfy condition 1 and 2. So ideally we dont have any firm answer.
3! and 4! are not divisible by 5 and are divisible by 6

Please advice.
[Reveal] Spoiler: OA

Last edited by Bunuel on 05 Jul 2013, 00:24, edited 1 time in total.
Edited the question and added the OA.
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Re: Is X a prime integer? [#permalink] New post 01 Apr 2010, 06:59
rohitgoel15 wrote:
Sorry to open a new thread:
gmat-diagnostic-test-question-79332.html

Is X a prime integer?

(1) x! is not divisible by 5
(2) |x|! is divisible by 6
The answer is C.
Doesnt 3 and 4 both satisfy condition 1 and 2. So ideally we dont have any firm answer.
3! and 4! are not divisible by 5 and are divisible by 6

Please advice.


st 1) x can be 1,2,3,4. Not sufficient
st 2) |x| > 2 . Not sufficient

combinging, we get x = 3 or 4 .. not sufficient

E
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Re: Is X a prime integer? [#permalink] New post 02 Apr 2010, 16:05
I think it is A.because when x! isn't divisible by 5 so it must be 4! or 3! when it says that x is a prime number so it should be 3! so A is the answer.
Am I wrong?
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Re: Is X a prime integer? [#permalink] New post 02 Apr 2010, 16:11
sooorryy I made mistake
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Re: Is X a prime integer? [#permalink] New post 02 Apr 2010, 18:35
Statement 1 X<5 NS
Statement 2 X<=3 NS

Combined 3,4 satisfy it and 3 is a prime and 4 is not so NS
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Re: Is X a prime integer? [#permalink] New post 03 Apr 2010, 00:28
I am also getting "E" as the answer.

In OE, the statement 2 is summaized as x <= -3 or x >= 3.

I couldnt understand this. Why 4 is not considered?
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Re: Is X a prime integer? [#permalink] New post 21 Jun 2010, 20:38
Is X a prime integer?

(1) x! is not divisible by 5
(2) |x|! is divisible by 6

Is factorial always an integer? can we have a non-integer factorial? Can factorial be negative? Someone please clarify....
if factorial is always an integer and positive, then
1. x=0,1,2,3,4
2. X=3,4,....

1+2
x=3,4 E
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Re: Is X a prime integer? [#permalink] New post 22 Jun 2010, 03:11
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Yes, OA for this one is not correct.

Is x a prime integer?

(1) x! is not divisible by 5 --> x=0, 1, 2, 3, or 4. Not sufficient.

(2) |x|! is divisible by 6 --> |x|>2. Not sufficient.

(1)+(2) x=3 (prime) or x=4 (not prime). Not sufficient.

Answer: E.
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Re: Is X a prime integer? [#permalink] New post 22 Jun 2010, 07:10
Thanks Bunuel for the detailed explanation
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Re: Is X a prime integer? [#permalink] New post 16 Dec 2013, 07:19
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Re: Is X a prime integer?   [#permalink] 16 Dec 2013, 07:19
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