Value of M

[mathdumber]

Q1. If lM+4l = 2, what is the value of M?
1) M < 0
2) M^2 + 8M +12 = 0


-------------------------------------
Q2. IF X>1 and Y>1, is X<Y?
1) X^2 / (XY+X) < 1
2) XY/ Y^2 -Y < 1

(FROM SET 25)









Official Answer

SPOILER: EE

[rinku008]

IMO for the second one it should be B

[eltonr]

First is E

1) | M + 4| = 2 implies that M+4 = 2 or M+4 = -2
i.e M = -2 or M = -6
From cond 1) M<0, insufficient

From cond 2) M^2 + 8M +12 = 0
Hence (M+2)(M + 6) = 0
Again M = -2 or M = -6
Combining both insufficient
Therefore E


Second problem
From st 1 X/ (Y +1) < 1 => X< Y+1
From st 2 X / (Y -1) < 1 => X < Y - 1 => X < Y

Therefore B

Elton

[mathdumber]

i guess the Official Answer for the second question is wrong then
i also have chosen B for the second question..
gd explanation guys!
appreciate it

[lsr]

Answer for the second one is E.
See link below.
http://www.urch.com/forums/gmat-data...set25qq29.html (gmatset25qq29)

[Jotun]

Yes but it all comes down to the way the denominator is written.
You won't find such ambiguous presentations of questions on the real GMAT.
There everything is written clearly.
This is not a real issue.