|
|
GMAT Club Daily Prep
Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.
Customized
for You
Track
Your Progress
Practice
Pays
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
Updated on: 25 Sep 2016, 06:52
Originally posted by Nevernevergiveup on 25 Sep 2016, 05:10.
Last edited by Nevernevergiveup on 25 Sep 2016, 06:52, edited 2 times in total.
Last edited by Nevernevergiveup on 25 Sep 2016, 06:52, edited 2 times in total.
Renamed the topic, edited the question and tags.
Kudos
Bookmarks
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:
46% (01:08) correct
54%
(00:52)
wrong
based on 312
sessions
History
Date
Time
Result
Not Attempted Yet
What is the value of k?
(1) \(k^4 = \frac{1}{625}\)
(2) \(k^3 < k^2\)
(1) \(k^4 = \frac{1}{625}\)
(2) \(k^3 < k^2\)
Pure algebraic questions like this one are no longer part of the GMAT Data Sufficiency syllabus.
For relevant Data Sufficiency questions, please check the Data Sufficiency forum:
Data Sufficiency Forum
Data Sufficiency Forum
25 Sep 2016, 05:49
Kudos
Bookmarks
(1) \(K^4 = \frac{1}{625}\)
\(K^4\) =\(5^{-4}\)
==> k= \(5^{-1}\)= \(\frac{1}{5}\) or k =\(- \frac{1}{5}\) --Not Sufficient
(2) \(k^3 < K ^2\) -- Not sufficient
Lets combine (1) and (2).
\(k^3 < K ^2\) ==> \((- \frac{1}{5} )^3 < (- \frac{1}{5} )^2 ==> - \frac{1}{125} < \frac{1}{25}\) --True
\(k^3 < K ^2\) ==> \(( \frac{1}{5} )^3 < (- \frac{1}{5} )^2 ==> \frac{1}{125} < \frac{1}{25}\) --True
Ans E.
\(K^4\) =\(5^{-4}\)
==> k= \(5^{-1}\)= \(\frac{1}{5}\) or k =\(- \frac{1}{5}\) --Not Sufficient
(2) \(k^3 < K ^2\) -- Not sufficient
Lets combine (1) and (2).
\(k^3 < K ^2\) ==> \((- \frac{1}{5} )^3 < (- \frac{1}{5} )^2 ==> - \frac{1}{125} < \frac{1}{25}\) --True
\(k^3 < K ^2\) ==> \(( \frac{1}{5} )^3 < (- \frac{1}{5} )^2 ==> \frac{1}{125} < \frac{1}{25}\) --True
Ans E.
25 Sep 2016, 11:27
Kudos
Bookmarks
Nevernevergiveup
(1) K=1/5 or -1/5 .....not sufficient
(2)K^3-K^2<0
K^2(K-1)<0--------->K-1<0------->K<1.......not suff...
Combining again as K<1 (from 2)
K=1/5 or -1/5 .....not suff
Ans E
