absolute value!

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Ozlemg: Master | Next Rank: 500 Posts; Posts: 407; Joined: Tue Jan 25, 2011 9:19 amFollowed by: 7 members; Thanked: 25 times

by Ozlemg » Fri Jul 15, 2011 6:03 am

is M < 0?

(1) -M = |-M|
(2) M square = 9, in other words, M^2 = 9

Oa will follow after discussions!

The more you suffer before the test, the less you will do so in the test!

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Source: Beat The GMAT — Data Sufficiency | Fri Jul 15, 2011 6:03 am

Frankenstein: Legendary Member; Posts: 1448; Joined: Tue May 17, 2011 9:55 amFollowed by: 53 members; Location: India; Thanked: 375 times

by Frankenstein » Fri Jul 15, 2011 6:06 am

Hi,
From(1):
-M = |-M|
-M should be non- negative. So, M is non-positive
i.e. M <= 0
Not sufficient

From(2):
M =-3 or M= +3
Not sufficient

From(1) and (2):
M <= 0 and M = -3 or +3
So, M = -3
M<0
Sufficient

Hence, C

PS: I have deleted my post on the other thread. So, you may delete that thread.

Cheers!

Things are not what they appear to be... nor are they otherwise

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