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27 Feb 2017, 04:31
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C
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Difficulty:
15%
(low)
Question Stats:
80% (01:18) correct
20%
(01:26)
wrong
based on 105
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27 Feb 2017, 07:55
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Bunuel
Is xy < 18 ?
(1) x + y < 6
(2) x > 0 and y > 0
(1) x + y < 6
(2) x > 0 and y > 0
1)x+y<6
Consider x=-6 & y=-6 x+y=-12 and xy>18--No
Consider x=-6 & y=-1 x+y=-7 and xy<18--Yes
Not Suff
2)x>0 & y>0
Consider x=6 & y=6 xy>18--No
Consider x=6 & y=1 xy<18--Yes
Not Suff
Combining 1 and 2
x and y should be +ve and x+y<6
Hence C
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28 Feb 2017, 04:24
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Is xy < 18 ?
(1) x + y < 6
Let x=1 & y=1 ..........2<6............1<18.......Answer is Yes
Let x=-10 & y=-10....-20<6..........200<18...Answer is No
Insufficient
(2) x > 0 and y > 0
Let x=1 & y=1 .............1<18.......Answer is Yes
Let x=10 & y=-0..........200<18...Answer is No
Insufficient
Combining 1 & 2
x & y are positive and there should their sum must be less than 6. The answer will be always xy<18
Answer: C
(1) x + y < 6
Let x=1 & y=1 ..........2<6............1<18.......Answer is Yes
Let x=-10 & y=-10....-20<6..........200<18...Answer is No
Insufficient
(2) x > 0 and y > 0
Let x=1 & y=1 .............1<18.......Answer is Yes
Let x=10 & y=-0..........200<18...Answer is No
Insufficient
Combining 1 & 2
x & y are positive and there should their sum must be less than 6. The answer will be always xy<18
Answer: C
