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12 Mar 2018, 21:46
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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:
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Question Stats:
94% (00:47) correct
6%
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wrong
based on 146
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If x and y are integers, which of the following must be an even integer?
A. x + y
B. x + y + 1
C. 2xy + 1
D. 2xy + 2
E. 2x/y
A. x + y
B. x + y + 1
C. 2xy + 1
D. 2xy + 2
E. 2x/y
12 Mar 2018, 21:50
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Bunuel
2. Properties of Integers
- Theory
Math: Number Theory
Number Properties: Tips and hints
Advanced Number Properties on GMAT (All 5 parts)
Do you make these 3 mistakes in GMAT Even-Odd Questions?
Everything about Factorials on the GMAT
Solving Complex Problems Using Number Line
For other subjects:
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12 Mar 2018, 22:07
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IMO D
A)
when both x,y = even/odd ; x + y = even
when x =even, y = odd ; x+ y = odd
when x =odd, y = even; x+ y = odd
B)
when x+ y = odd; x + y+ 1 = even
when x+ y = even ; x + y+ 1 = odd
C) 2xy + 1 => 2xy --always even + 1 = odd
D) 2xy + 2 = even + even = even => answer
E) 2x/y => result may or may not be an integer
A)
when both x,y = even/odd ; x + y = even
when x =even, y = odd ; x+ y = odd
when x =odd, y = even; x+ y = odd
B)
when x+ y = odd; x + y+ 1 = even
when x+ y = even ; x + y+ 1 = odd
C) 2xy + 1 => 2xy --always even + 1 = odd
D) 2xy + 2 = even + even = even => answer
E) 2x/y => result may or may not be an integer
