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24 Mar 2015, 04:44
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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:
35%
(medium)
Question Stats:
73% (01:52) correct
27%
(01:45)
wrong
based on 162
sessions
History
Date
Time
Result
Not Attempted Yet
If k is an integer, what is the value of k?
(1) 1/5 < 1/(k - 1) < 1/2
(2) 3 < (k + 3)/2 < 5
(1) 1/5 < 1/(k - 1) < 1/2
(2) 3 < (k + 3)/2 < 5
Bunuel
(1) 1/5 < 1/(k - 1) < 1/2
Since K is integer (k-1) will be an integer so there are two possible values
k-1=4; K=5
k-1=3; K=4
Not Sufficient.
(2) 3 < (k + 3)/2 < 5
(K+3)/2 , we can find multiple values of K from this inequality.
eg: (K+3)/2=3.5 so K = 4
(K+3)/2=4 so K = 5
(K+3)/2=4.5 so K = 6
Combining A and B , still insufficient.
Answer E
24 Mar 2015, 08:52
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I'm getting answer choice E.
k has to be an integer so
(1) 1/5 < 1/(k-1) < 1/2
Then k = 5 or k = 4
1/5 < 1/4 < 1/2 -OR- 1/5 < 1/3 < 1/2
(2) 3 < (k + 3)/2 < 5
Then k = 4, k = 5, or k = 6
3 < 3.5 < 5 -OR- 3 < 4 < 5 -OR- 3 < 4.5 < 5
From (1) we know k is 5 or 4 and from (2) we know it's 4, 5, or 6 and therefore insufficient - E
k has to be an integer so
(1) 1/5 < 1/(k-1) < 1/2
Then k = 5 or k = 4
1/5 < 1/4 < 1/2 -OR- 1/5 < 1/3 < 1/2
(2) 3 < (k + 3)/2 < 5
Then k = 4, k = 5, or k = 6
3 < 3.5 < 5 -OR- 3 < 4 < 5 -OR- 3 < 4.5 < 5
From (1) we know k is 5 or 4 and from (2) we know it's 4, 5, or 6 and therefore insufficient - E
