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Score Plus Forums International Education GRE GRE Question of the Day
2010-02-27-Problem Solving (0 viewing) 
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TOPIC: 2010-02-27-Problem Solving
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2010-02-27-Problem Solving 5 Months ago Karma: 13  
If both x and y are prime numbers, which of the following CANNOT be the difference of x and y?

(A) 1
( 3
(C) 9
(D) 15
(E) 23

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