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# GMAT Diagnostic Test Question 12

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Manager
Joined: 24 Apr 2010
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Re: GMAT Diagnostic Test Question 11 [#permalink]  03 Sep 2010, 08:57
i think unless premeditated....it would be very difficult to get this right with in 2 minutes...it took me more than 2 minutes still i got it wrong because i think there are too many cases to check and too many exceptions....
is it spoiling the test....poll may give better view....with how many got it right...
thanks
Manager
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Re: GMAT Diagnostic Test Question 11 [#permalink]  09 Oct 2010, 02:54
I did not consider "0" in either case.... My bad!
Intern
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Re: GMAT Diagnostic Test Question 11 [#permalink]  01 Nov 2010, 20:41
I would beg to differ on the official answer 'C'...as the Question states.

N = 1234@ and @ represents the units digit, is N a multiple of 5?

(1) @! is not divisible by 5
(2) @ is divisible by 9

(1)@! is not divisible by 5 so @ cannot be 0 or 5==> N is not a multiple of 5==> can answer the question
(2)@ is divisible by 9 so @ is 0 or 9; if it is 0 ==> N is a multiple of 5; if @ is 9 N is not a multiple of 5==>Not sufficient!

I choose A
Math Expert
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Re: GMAT Diagnostic Test Question 11 [#permalink]  01 Nov 2010, 22:49
Expert's post
soundofmusic wrote:
I would beg to differ on the official answer 'C'...as the Question states.

N = 1234@ and @ represents the units digit, is N a multiple of 5?

(1) @! is not divisible by 5
(2) @ is divisible by 9

(1)@! is not divisible by 5 so @ cannot be 0 or 5==> N is not a multiple of 5==> can answer the question
(2)@ is divisible by 9 so @ is 0 or 9; if it is 0 ==> N is a multiple of 5; if @ is 9 N is not a multiple of 5==>Not sufficient!

I choose A

Red part is not correct.

1233@ to be divisible by 5 symbol @ should represent either 0 or 5. So the question asks whether @ equals to 0 or 5.

(1) @! is not divisible by 5 --> @ can be 0, 1, 2, 3, or 4 (note that $$0!=1$$). Not sufficient.
(2) @ is divisible by 9 --> @ can be 0 or 9 (note that zero is divisible by every integer except zero itself). Not sufficient.

(1)+(2) Intersection of the values for @ from (1) and (2) is @=0. Sufficient.

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Senior Manager
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Re: GMAT Diagnostic Test Question 11 [#permalink]  19 May 2011, 05:25
How can 4 be a possibility of "@"? 4! results in 24 and the question clearly states that "@" is a "ones digit" so you cant plug in 24 as a "ones digit" so the option narrows down to 0,1,2, or 3. Doesn't it?
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Intern
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Re: GMAT Diagnostic Test Question 11 [#permalink]  13 Aug 2011, 17:27
i am still trying to grasp why for statement 2 to be correct, @ has to be 9? When you plug in 9, N is not divisible by 9, only 8 is!
Am I just missing something here? Are there any quick trick to divisibility that I am not aware of?
Manager
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Re: GMAT Diagnostic Test Question 11 [#permalink]  30 Oct 2011, 03:48
ooops divisibility of 0!!
good !
divisible by 9, i thought it implied only 9 and got 'E'
Intern
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Re: GMAT Diagnostic Test Question 11 [#permalink]  20 Aug 2013, 19:03
chuyencao wrote:
N = 1234@ and @ represents the units digit, is N a multiple of 5?

(1) @! is not divisible by 5
(2) @ is divisible by 9

=======
(1)@! is not divisible by 5 so @ is not 0 or 5==> N is not a multiple of 5==> can answer the question
(2)@ is divisible by 9 so @ is 0 or 9; if it is 0 ==> N is a multiple of 5; if @ is 9 N is not a multiple of 5==>Not sufficiency!
I choose A
Please give me the feedback !

Math Expert
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Re: GMAT Diagnostic Test Question 11 [#permalink]  21 Aug 2013, 02:24
Expert's post
T740qc wrote:
chuyencao wrote:
N = 1234@ and @ represents the units digit, is N a multiple of 5?

(1) @! is not divisible by 5
(2) @ is divisible by 9

=======
(1)@! is not divisible by 5 so @ is not 0 or 5==> N is not a multiple of 5==> can answer the question
(2)@ is divisible by 9 so @ is 0 or 9; if it is 0 ==> N is a multiple of 5; if @ is 9 N is not a multiple of 5==>Not sufficiency!
I choose A
Please give me the feedback !

The red part is not correct: 0!=1, so from (1) @ can be 0.

Complete solution is here: gmat-diagnostic-test-question-79339-20.html#p811396

Hope it helps.
_________________
Re: GMAT Diagnostic Test Question 11   [#permalink] 21 Aug 2013, 02:24

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# GMAT Diagnostic Test Question 12

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