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Updated on: 20 Nov 2016, 08:07
Originally posted by ananthpatri on 05 Aug 2012, 23:02.
Last edited by stonecold on 20 Nov 2016, 08:07, edited 2 times in total.
Last edited by stonecold on 20 Nov 2016, 08:07, edited 2 times in total.
Edited the question.
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Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
45%
(medium)
Question Stats:
65% (01:31) correct
35%
(01:31)
wrong
based on 446
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If x is a positive integer, is (x+y) even?
(1) K^x*K^y =1
(2) K is not equal to 1
(1) K^x*K^y =1
(2) K is not equal to 1
06 Aug 2012, 00:54
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ananthpatri
If x is a positive integer, is (x+y) even?
(1) K^x*K^y =1
(2) K is not equal to 1
(1) K^x*K^y =1
(2) K is not equal to 1
(1) States \(K^{x+y}=1\). If \(K = 1, x + y\) can be odd or even. Not sufficient.
(2) Nothing about \(x + y\). Not sufficient.
(1) and (2) together: Sufficient, because necessarily \(x + y = 0\).
Answer C.
06 Aug 2012, 01:03
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EvaJager
ananthpatri
If x is a positive integer, is (x+y) even?
(1) K^x*K^y =1
(2) K is not equal to 1
(1) K^x*K^y =1
(2) K is not equal to 1
(1) States \(K^{x+y}=1\). If \(K = 1, x + y\) can be odd or even. Not sufficient.
(2) Nothing about \(x + y\). Not sufficient.
(1) and (2) together: Sufficient, because necessarily \(x + y = 0\).
Answer C.
x+y is not necessarily zero. If k=-1, then x+y can be ANY even number.
