1) M+N < 0 is not sufficientadorendra wrote:Is M =/= N ? ( Not equal to)
1. M+N <0
2. MN <0
-4+-4 = -8
-4+ -3 = -7
2) MN<0 is sufficient
if M = N
MN>0
so if MN<0 M is not equal to N
Sufficient
Hence B
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Is M Not equal to N
Source: Beat The GMAT — Data Sufficiency |
-4+-4 = -8
-4+ -3 = -7
2) MN<0 is sufficient
if M = N
MN>0
so if MN<0 M is not equal to N
Sufficient
Hence B
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thephoenix
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adorendra wrote:Is M =/= N ? ( Not equal to)
1. M+N <0
if m=n=-3--->m+n<0
ifm=-2 and n=-3---->m+n=-5<0
but m#n
hence insuff
2. MN <0
--->if m<0---->n>0
and if m>0---->n<0
hence in bth the case m#n
hence suff
B
