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colakumarfanta
- Senior | Next Rank: 100 Posts
- Posts: 49
- Joined: Mon May 03, 2010 2:55 am
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if any of x,y,z is zero xyz=0 will be true
From 1
yz>-yz .. or yz is positive ..or in other words yz is non zero...no information about x.....not sufficient
From 2
y-z=1...or atleast one of y,z is non zero...no information about x.....not sufficient
combining
still we cannot say definitely that xyz is 0....
Ans option E
