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20 Feb 2015, 01:28
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E
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
55%
(hard)
Question Stats:
54% (01:58) correct
46%
(01:45)
wrong
based on 59
sessions
History
Date
Time
Result
Not Attempted Yet
Which is the greatest among p,q and r?
(1) p = q +5r + 8
(2) r=p^2
Posted from my mobile device
(1) p = q +5r + 8
(2) r=p^2
Posted from my mobile device
20 Feb 2015, 13:22
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HI rajthakkar,
This question is "quirky" in the realm of DS, in that it doesn't fit the traditional 'design' of Value or Yes/no prompts. We're asked which of 3 variables (P, Q and R) is largest. You'll find that TESTing VALUES will help you to quickly prove the insufficiencies involved.
Fact 1: P = Q + 5R + 8
IF....
Q=0
R=0
P=8
Then P is the largest value.
IF...
Q=0
R= -2
P= -2
Then Q is the largest value.
IF....
Q= -9
R=0
P= -1
Then R is the largest value.
Fact 1 is INSUFFICIENT
Fact 2: R = P^2
This tells us nothing about Q. ANY of the variables could be largest.
Fact 2 is INSUFFICIENT.
Combined, we know:
P = Q + 5R + 8
R = P^2
IF...
P=2
R=4
Q= -26
Then R is the largest value
IF...
P=1/2
R=1/4
Q= -8 3/4
Then P is the largest value
Combined, INSUFFICIENT
Final Answer:
GMAT assassins aren't born, they're made,
Rich
This question is "quirky" in the realm of DS, in that it doesn't fit the traditional 'design' of Value or Yes/no prompts. We're asked which of 3 variables (P, Q and R) is largest. You'll find that TESTing VALUES will help you to quickly prove the insufficiencies involved.
Fact 1: P = Q + 5R + 8
IF....
Q=0
R=0
P=8
Then P is the largest value.
IF...
Q=0
R= -2
P= -2
Then Q is the largest value.
IF....
Q= -9
R=0
P= -1
Then R is the largest value.
Fact 1 is INSUFFICIENT
Fact 2: R = P^2
This tells us nothing about Q. ANY of the variables could be largest.
Fact 2 is INSUFFICIENT.
Combined, we know:
P = Q + 5R + 8
R = P^2
IF...
P=2
R=4
Q= -26
Then R is the largest value
IF...
P=1/2
R=1/4
Q= -8 3/4
Then P is the largest value
Combined, INSUFFICIENT
Final Answer:
GMAT assassins aren't born, they're made,
Rich
Updated on: 24 Feb 2015, 02:02
Originally posted by OptimusPrepJanielle on 22 Feb 2015, 04:33.
Last edited by OptimusPrepJanielle on 24 Feb 2015, 02:02, edited 1 time in total.
Last edited by OptimusPrepJanielle on 24 Feb 2015, 02:02, edited 1 time in total.
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rajthakkar
1) Using the first condition we can get infinite values of p, q and r. Also, we don't know if they are positive or negative.
Since we don't get any UNIQUE values, this condition is insufficient.
2) Using the second condition, we don't know anything about the value of q.
3) Using BOTH the conditions, we get:
p = q + p^2 + 8
Once again, we can have infinite value of p and q.
Hence the answer is E.
--
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