Hi All,
When absolute values 'interact' with inequalities, it can sometimes be difficult to automatically spot all of the possible values that "fit." In these situations, you can usually TEST VALUES to figure out which values "fit" and which do not.
Here, we're asked if 1 > |X-1|. This is a YES/NO question.
Before dealing with the two Facts, we can think about what would gives us a "YES" answer and what would give us a "NO" answer...
X = 1 is an obvious YES answer, since 1 > 0.
X = 2 gives us a NO answer, since 1 is NOT > 1
X = 0 gives us a NO answer too.
So 0 and 2 are the "borders"; with a bit more 'playing around', you'll see that any value BETWEEN 0 and 2 will give us a YES answer.
All other values, including 0 and 2, will give us a NO answer.
Fact 1: (X-1)^2 > 1
Neither 0 nor 2 will fit this inequality (since 1 is NOT > 1). Any value BETWEEN 0 and 2 will turn the parentheses into a positive fraction, which also doesn't fit (since a positive fraction is NOT > 1). By eliminating all of the values that would lead to a NO answer, the only values that fit will create a YES answer. The answer will ALWAYS be YES.
Fact 1 is SUFFICIENT.
Fact 2: 0 > X
This Fact also eliminates all of the values that would lead to a NO answer, so all that is left are YES answers.
Fact 2 is SUFFICIENT
Final Answer:
GMAT assassins aren't born, they're made,
Rich
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