assuming you're a relative beginner at DS, here are a couple of relevant pieces of advice.
statement (1):
BE SURE that you appreciate the DIRECTIONALITY of data sufficiency problems. weirdly enough, they "read upside down": namely, you have to read the problem as "IF (statement), THEN (question prompt)".
so, this statement reads as follows:
IF -1/2 < x < 3/2, THEN is 0 < x < 1?
this should be a clear "i don't know", because the interval between -1/2 and 3/2 includes numbers that are both inside and outside the interval from 0 to 1.
insufficient.
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statement (2):
it's good enough to REALIZE THAT THIS STATEMENT HAS EXACTLY 1 SOLUTION.
there's no need to actually solve anything! just realize that you're only going to get one answer, and, therefore, the answer to the question prompt will either be "definitive yes" or "definitive no".
it doesn't matter which of these is the actual answer; either way, it's sufficient.
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ans = b
Ron has been teaching various standardized tests for 20 years.
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Quand on se sent bien dans un vêtement, tout peut arriver. Un bon vêtement, c'est un passeport pour le bonheur.
Yves Saint-Laurent
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