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Strong concept tested: Please help me out

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Senior | Next Rank: 100 Posts
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by gmat620 » Sat Nov 21, 2009 3:29 am
Is M < 0 ?

1. - M = | - M |
2. M^2 = 9

Hello Friends, I think mod is always positive, please help me out on this one...This question isn't tough but concept is required. I am little bit confused. Please help me. Thanks in advance.
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Source: — Data Sufficiency |
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by palvarez » Sat Nov 21, 2009 12:01 pm
|a| = |-a|


1. -M = |M|, therefore M<=0. Insufficient, since M can be 0
2. M = 3 or -3. Insufficient.

Combined, M = -3. Sufficient.

C is the answer
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by RoadtoIVY » Sat Nov 21, 2009 5:24 pm
You are right mode is always positive:

Is M < 0 ?

1. - M = | - M |
2. M^2 = 9

1. - M = | - M | is true only for M=0, Hence M is not less than 0. Sufficient
2. M^2 = 9, gives you M=3,-3 hence Not Sufficient

IMO A
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by gmat620 » Sun Nov 22, 2009 3:30 pm
OA C
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