From Mastering Problems to GMAT Mastery
Compare the statement xy — yx, where x is prime and y is even, to the statement x = 2.
The statements provide the same information in the end, but one is unquestionably
more difficult than the other.
In Data Sufficiency, the level of difficulty is not wholly dependent on the difficulty of
the concept; it depends in part on the skill with which the test writer conceals the nec
essary information. As you study, you should note any questions where the information
was cleverly hidden and work backwards through the levels to see how the writers were
able to mislead you. Many of their tricks appear over and over in questions in the Of
ficial Guide. If you learn to spot them, you will have an enormous advantage over other
test-takers.
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