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Is M Not equal to N

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Source: — Data Sufficiency |
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by ajith » Wed Feb 03, 2010 12:42 pm
adorendra wrote:Is M =/= N ? ( Not equal to)

1. M+N <0
2. MN <0
1) M+N < 0 is not sufficient

-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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by thephoenix » Wed Feb 03, 2010 1:05 pm
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
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