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anastasios1984
- Junior | Next Rank: 30 Posts
- Posts: 12
- Joined: Tue Jan 17, 2012 5:45 pm
Statement 1: xy > 0, x and y are of same signanastasios1984 wrote:Is Z<0?
i) x*y>0 , z*y>0
ii)x>0
zy > 0, z and y are of same sign
Hence, x, y, and z are all of same sign.
As we know nothing about the sign of either x or y, we can't say whether z < 0 or not.
Not sufficient
Statement 2: We don't know what is the relation between x and z. So we can't say whether z < 0 or not.
Not sufficient
1 & 2 Together: Now we know, x is positive and z is of same sign as of x. Hence, z > 0.
Sufficient
The correct answer is C.
