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GMAT Coordinate Geometry http://www.800score.com/forum/viewtopic.php?f=3&t=30 
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Author:  questioner [ Mon Jun 18, 2012 3:55 pm ] 
Post subject:  Re: math (test 1, question 26): probability, x,yplane 
Does this question account for areas where X is positive and Y is negative? For example, in the fourth quadrant, aren't all X values greater than Y values? Wouldn't the same apply for half of the third quadrant as well? 
Author:  Gennadiy [ Mon Jun 18, 2012 4:03 pm ] 
Post subject:  Re: math (test 1, question 26): probability, x,yplane 
Quote: Does this question account for areas where X is positive and Y is negative? No, the question statement implies Quadrant 1 only.Quote: ... , what is the probability that x > y > 0? If we didn't have that "> 0", then your reasoning would be true, we would need to look into all quadrants. Sometimes a little part of the information in a question statement slips the mind and it can affect the whole reasoning and lead to a wrong answer choice. Reading every word and symbol in a question statement is very important. Do not hurry, when reading the question statement. 
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