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Tough one - Math experts pls help with a simpler soln.

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Source: — Data Sufficiency |

by Anju@Gurome » Tue Mar 12, 2013 8:31 pm
himu wrote:If a and b are integers, and |a| > |b|, is a · |b| < a - b?

(1) a < 0

(2) ab 0
I think statement 2 is ab ≥ 0.

(1) a < 0
If a = -1, b = 0, then a · |b| = 0 and a - b = -1. Here, a · |b| > a - b.
If a = -1, b = -2, then a · |b| = -1 * 2 = -2 and a - b = 1. Here, a · |b| < a - b.
No definite answer; NOT sufficient.

(2) ab ≥ 0
We can take same examples as in statement 1, as they satisfy the given conditions here also.
If a = -1, b = 0, then a · |b| = 0 and a - b = -1. Here, a · |b| > a - b.
If a = -1, b = -2, then a · |b| = -1 * 2 = -2 and a - b = 1. Here, a · |b| < a - b.
No definite answer; NOT sufficient.

Combining (1) and (2), we do not get any new information, since the same examples given above satisfy both statements.

The correct answer is E.
Anju Agarwal
Quant Expert, Gurome

Backup Methods : General guide on plugging, estimation etc.
Wavy Curve Method : Solving complex inequalities in a matter of seconds.

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