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10 Sep 2012, 21:12
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C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
25%
(medium)
Question Stats:
75% (01:35) correct
25%
(01:42)
wrong
based on 125
sessions
History
Date
Time
Result
Not Attempted Yet
If qs not equal to zero is p/q > (r^2)/s ?
(1) p/q > r/s
(2) r=1
(1) p/q > r/s
(2) r=1
OA is C but my doubt is if p/q =3/4 and r/s = 2/3 then p/q will be less than (r^2) /s=4/3. so why can't A be sufficient. Pls clarify.
Thanks,
Thanks,
10 Sep 2012, 22:26
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harikris
How about if p/q =3/4 and r/s = 2/21 then p/q will be more than (r^2) /s= 4/21. Hence, A is not sufficient.
Considering A & B together ensures that r = r^2 = 1. Hence C is the answer.
12 Sep 2012, 08:23
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harikris
Let me tell you the basic requirement of solving any DS question. In DS question we need to prove that we have found 'ONLY ONE' answer.
It
In your case, you are correct in finding a value for which the condition is true. But, this is not the "ONLY ONE" value.
For example what about p/q= 2/3 and r/s = .5/2 ? In this case,\(r^2/s\)= 1/8. Hence, p/q >r/s
For more clarification let me put some excerpts from OG12. This will clear your doubt about the difference between Problem Solving (PS) and Data Sufficiency (DS) question.
"4. Answer the question asked.
For example, if the question asks, “What is the value of y ?” for an answer statement to be sufficient, you must be able to find one and only one value for y. Being able to determine minimum or maximum values for an answer (e.g., y = x + 2) is not sufficient, because such answers constitute a range of values rather than the specific value of y."
