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B
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Difficulty:
55%
(hard)
Question Stats:
42% (00:58) correct
58%
(00:47)
wrong
based on 26
sessions
History
Date
Time
Result
Not Attempted Yet
True or false: N is a positive number.
Statement 1: N=|N|
Statement 2: N>N^2
Statement 1: N=|N|
Statement 2: N>N^2
Pure algebraic questions like this one are no longer part of the GMAT Data Sufficiency syllabus.
For relevant Data Sufficiency questions, please check the Data Sufficiency forum:
https://gmatclub.com/forum/data-sufficiency-ds-141/
https://gmatclub.com/forum/data-sufficiency-ds-141/
25 Sep 2019, 08:34
Kudos
Bookmarks
Statement 2 is sufficient.
Statement 1 says,
|N|=N, only true when N>=0
Question asks is N +ve or -ve, but N can be 0 as stated above (0 is non-negative)
Hence not sufficient
Statement 2 Says
N>N^2
N^2 is always >=0
so, N>0
sufficient
Statement 1 says,
|N|=N, only true when N>=0
Question asks is N +ve or -ve, but N can be 0 as stated above (0 is non-negative)
Hence not sufficient
Statement 2 Says
N>N^2
N^2 is always >=0
so, N>0
sufficient
25 Sep 2019, 09:32
Kudos
Bookmarks
minustark
Statement 1: N=|N|
N could be 0 -> No N is not positive
N could be 1,2,3.etc ( any positive number) -> yes N is positive
Hence Insuff.
Statement 2:N>N^2
->N^2-N<0
->N(N-1)<0
->0< N <1 hence N can only be positive. Suff.
Ans- B
