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28 May 2017, 02:42
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D
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
25%
(medium)
Question Stats:
76% (01:01) correct
24%
(01:24)
wrong
based on 72
sessions
History
Date
Time
Result
Not Attempted Yet
If x and y are positive integers, is \(\sqrt{2xy}\) an integer?
(1) y – x = 0
(2) xy = 1
(1) y – x = 0
(2) xy = 1
Luckisnoexcuse
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28 May 2017, 03:05
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(1) says y=x and hence with x and y being positive integers the equation cannot be an integer (either x should have been 2y or y/2 ) hence sufficient
(2) substituting the value ..sufficient to answer
Hence D
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(2) substituting the value ..sufficient to answer
Hence D
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29 May 2017, 03:44
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Statement 1 gives x = y. So it gives us the answer that √(2xy) = x √(2) or y √(2) will not be integer. Sufficient.
Statement 2 gives x = 1/y. So it gives us the answer, √(2xy) = √(2) will not be integer. Sufficient.
Option D is correct.
Statement 2 gives x = 1/y. So it gives us the answer, √(2xy) = √(2) will not be integer. Sufficient.
Option D is correct.
