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Source: — Data Sufficiency |
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by dhanu_ghag » Mon Jul 28, 2008 11:30 pm
========================
Is x between 0 and 1?

1)x is between -1/2 and 3/2
2)3/4 is 1/4 more than x
====================

1)On a numerline, -1/2 is -0.5 and 3/2 is 1.5, So the rane is -0.5 to 1.5 From this we cannot makeout if x is between 0 and 1 as x xould also be between -0.5 to 0 and 1 to 1.5. So cannot determine from A

2)Solving this, 3/4-1/4=x
hence x=1/2
1/2=0.5 is between 0 and 1
B is the answer
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by lunarpower » Thu Jul 31, 2008 12:34 am
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.

--

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.

--

ans = b
Ron has been teaching various standardized tests for 20 years.

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by bhumika.k.shah » Wed Feb 03, 2010 9:46 am
hey thanks ron! :)

thats what i did... just thought whether would this give me 1 definite answer . Unlike the other DS kinds of sums "find the value of" dint have to literally form the equation for statement II .

:-)
lunarpower wrote: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.

--

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.

--

ans = b
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by aalexjacob » Sat Dec 15, 2012 1:15 am
lunarpower wrote: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.

--

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.

--

ans = b
I was like why does this guy have Ron's picture and call himself lunarpower, then it struck me... Lunarpower is an anagram for Ron Purewal... Nice one, Ron!!!
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