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06 Jul 2018, 00:15
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E
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Difficulty:
45%
(medium)
Question Stats:
67% (01:46) correct
33%
(01:41)
wrong
based on 218
sessions
History
Date
Time
Result
Not Attempted Yet
What is the value of (x - 1)(y + 1) ?
(1) x + y = 4
(2) xy = 3
M36-130
(1) x + y = 4
(2) xy = 3
M36-130
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16 Nov 2021, 09:26
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Bunuel
Official Solution:
What is the value of \((x - 1)(y + 1)\) ?
(1) \(x + y = 4\)
The above equation has infinitely many solutions for \(x\) and \(y\). Not sufficient.
(2) \(xy = 3\)
The above equation has infinitely many solutions for \(x\) and \(y\). Not sufficient.
(1)+(2) From \(x + y = 4\) we can get that \(x=1\) and \(y=3\) or \(x=3\) and \(y=1\). For the first case, \((x - 1)(y + 1)=0\) but for the second case, \((x - 1)(y + 1)=6\). Not sufficient.
Answer: E
General Discussion
06 Jul 2018, 00:36
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Bunuel
Individually insufficient.
combining, we have two values of both x and y for which (x - 1)(y + 1) will have two values.
hence, insufficient.
Ans (E)
