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04 May 2016, 01:46
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A
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
35%
(medium)
Question Stats:
77% (00:47) correct
23%
(00:36)
wrong
based on 13
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If mn = 0, is |m−n|>0?
(1) m≠0
(2) n=0
(1) m≠0
(2) n=0
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04 May 2016, 20:22
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mn =0; Is |m - n| > 0?
St1: m is not equal to 0 --> For mn to be = 0, n has to be 0.
|m - n| = |m| > 0
Sufficient
St2: n=0 --> m can be any integer including 0.
Not Sufficient
Answer: A
St1: m is not equal to 0 --> For mn to be = 0, n has to be 0.
|m - n| = |m| > 0
Sufficient
St2: n=0 --> m can be any integer including 0.
Not Sufficient
Answer: A
04 May 2016, 20:46
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Bunuel
When we see mn = 0, is |m−n|>0..
It means either m or n or both are 0..
then |m-n| will NOT be >0, ONLY when both m and n are 0..
so we have to find whether both are 0 or ONLY one..
(1) m≠0
so we know m is not equal to 0...so ans is YES
suff
(2) n=0
we do not know if m is also 0..
if m is 0, ans is NO..
if m is not 0, ans is YES
different answers possible
Insuff
A
