k#0, 1, and -1. is 1/k>0
1. 1/(k-1)>0
2. 1/(k+1)>0
Please explain - thanks
This topic has expert replies
- AVbyT
- Senior | Next Rank: 100 Posts
- Posts: 35
- Joined: Mon Jul 11, 2011 11:47 am
- Thanked: 1 times
- Followed by:1 members
Statement 1: For 1/(k-1)>0, k>1 => 1/k > 0. Hence, Sufficient
Statement2: For 1/(k+1)> 0, k > 0 OR 0 > k > -1.
For, k > 0 => 1/k > 0
BUT, for 0>k>-1, say k = -0.5, 1/k < 0
Hence, Insufficient
My Answer:A
Statement2: For 1/(k+1)> 0, k > 0 OR 0 > k > -1.
For, k > 0 => 1/k > 0
BUT, for 0>k>-1, say k = -0.5, 1/k < 0
Hence, Insufficient
My Answer:A
- arashyazdiha
- Master | Next Rank: 500 Posts
- Posts: 102
- Joined: Tue Mar 08, 2011 3:42 am
- Thanked: 2 times
the question means that is K>0?
1)if K>1
2)if K>-1
1)alone this is sufficient
2) it might be >0 or <0 so insufficient
I'll go with A
1)if K>1
2)if K>-1
1)alone this is sufficient
2) it might be >0 or <0 so insufficient
I'll go with A
-
- Legendary Member
- Posts: 2789
- Joined: Tue Jul 26, 2011 12:19 am
- Location: Chennai, India
- Thanked: 206 times
- Followed by:43 members
- GMAT Score:640
k#0, 1, and -1. is 1/k>0
1. 1/(k-1)>0
2. 1/(k+1)>0
FROM 1 and given,
K cannot be -1,0,1
K cannnot be -2 (1/-3 is not greater than 0)
K has to be +ve number > 1, Hence sufficient!
FROM 2 and given,
K cannot be -1,0,1
K cannnot be -2 (1/-1 is not greater than 0)
K has to be +ve number > 1, Hence sufficient!
IMO:D
1. 1/(k-1)>0
2. 1/(k+1)>0
FROM 1 and given,
K cannot be -1,0,1
K cannnot be -2 (1/-3 is not greater than 0)
K has to be +ve number > 1, Hence sufficient!
FROM 2 and given,
K cannot be -1,0,1
K cannnot be -2 (1/-1 is not greater than 0)
K has to be +ve number > 1, Hence sufficient!
IMO:D
- arashyazdiha
- Master | Next Rank: 500 Posts
- Posts: 102
- Joined: Tue Mar 08, 2011 3:42 am
- Thanked: 2 times
Hi GmatKiss,
But the thing is that there is no indication in the question stem that k has to be an integer.
Did you assume the same thing?
But the thing is that there is no indication in the question stem that k has to be an integer.
Did you assume the same thing?