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Need help in this one

Expert replies
by Winner2013 » Wed Aug 28, 2013 7:54 pm
If x is not equal to 0, is |x| less than 1?

(1) x / |x| < x

(2) |x| > x


Answer is both together are sufficient but neither one alone. I think both are individually sufficient. can someone help? Thank you.
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Source: — Data Sufficiency |

by Java_85 » Wed Aug 28, 2013 10:20 pm
(1) is true only if x>1 or 0<x<-1 ==> We can't answer the question! ==> B C E
for (2) to be true x should be negative i.e. x<0 ==> not B ==> answer is C or E
(1) and (2) together are true only for 0<x<-1 because it's the interval that both (1) and (2) are satisfied. ==> answer is C because for both statements to be true x should be 0<x<-1 and therefore |x|<1

Hope this helps!
Last edited by Java_85 on Thu Aug 29, 2013 8:31 am, edited 1 time in total.
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by [email protected] » Wed Aug 28, 2013 11:30 pm
Hi All,

Java_85 has the correct solution, but I want to point out two details that are worth noting.

First, the answer is NOT A (which is the first thing written).

Second, the inequality should be: -1 < x < 0 (NOT 0 < x < -1 which isn't mathematically correct).

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by GMATGuruNY » Thu Aug 29, 2013 8:24 am
If x is not equal to 0, is |x| less than 1?

(1) x/|x|< x

(2) |x| > x
Question rephrased: Is x between -1 and 1?

Statement 1: x/|x| < x
x < x|x|

0 < x|x| - x

0 < x (|x| - 1)

The CRITICAL POINTS are -1, 0 and 1.
These are the only values where x(|x|-1) = 0.
To determine the ranges where x(|x|-1) > 0, test one value to the left and right of each critical point.

Case 1: x<-1
Plug x = -2 into x/|x| < x:
-2/ |-2| < -2
-1 < -2.
Doesn't work.
Thus, x < -1 is not a valid range.

Case 2: -1<x<0
Plug x = -1/2 into x/|x| < x:
-1/2/ |-1/2| < -1/2
-1 < -1/2.
This works.
Thus, -1<x<0 is a valid range.

Case 3: 0<x<1
Plug x = 1/2 into x/|x| < x:
(1/2)/ |1/2| < 1/2
1 < 1/2
Doesn't work.
Thus, 0<x<1 is not a valid range.

Case 4: x>1
Plug x = 2 into x/|x| < x:
2/ |2| < 2
1 < 2.
This works.
Thus, x > 1 is a valid range.

Thus, -1<x<0 or x>1.
INSUFFICIENT.

Statement 2: |x| > x
Any negative value will satisfy this inequality.
If x=-1/2, then x is between -1 and 1.
If x=-2, then x is NOT between -1 and 1.
INSUFFICIENT.

Statements combined:
The only range that satisfies both statements is -1<x<0.
Thus, x is between -1 and 1.
SUFFICIENT.

The correct answer is C.
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