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27 Dec 2012, 23:07
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Difficulty:
15%
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Question Stats:
72% (00:52) correct
28%
(00:54)
wrong
based on 539
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Is the number n an integer?
(1) N - 7 is an integer
(2) N/1/3 is an integer
(1) N - 7 is an integer
(2) N/1/3 is an integer
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Marcab
Joined: 03 Feb 2011
Last visit: 22 Jan 2021
Posts: 840
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Status:Retaking after 7 years
Location: United States (NY)
Concentration: Finance, Economics
Schools: Simon '15 (M$)
GMAT 1: 720 Q49 V39
GPA: 3.75
28 Dec 2012, 00:20
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jsphcal
Statement 1) N-7 is an integer. Since 7 is also an integer hence N must also be an integer. Sufficient
Statement 2) It can be written as 3N is an integer. N can be a a fraction such as 1/3, then also 3N will be an inetger or N can be an integer even then 3N will be an integer. Two cases, hence insufficient.
+1A
28 Dec 2012, 05:11
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Is the number n an integer?
(1) N - 7 is an integer --> \(n-7=integer\) --> \(n=integer+7=integer\). Sufficient.
(2) N/1/3 is an integer. \(3n=integer\). If n=1, then the answer is YES but if n=1/3, then the answer is NO. Not sufficient.
Answer: A.
(1) N - 7 is an integer --> \(n-7=integer\) --> \(n=integer+7=integer\). Sufficient.
(2) N/1/3 is an integer. \(3n=integer\). If n=1, then the answer is YES but if n=1/3, then the answer is NO. Not sufficient.
Answer: A.
