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Is positive integer r an even number?

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Senior | Next Rank: 100 Posts
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by p2pg » Sat May 30, 2009 7:44 am
Is positive integer r an even number?
a) r is a prime number
b) 3<r<26

OAB But I think it should be C. Comments?
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Source: — Data Sufficiency |
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by raleigh » Sat May 30, 2009 8:45 am
(1) The only even prime number is 2. Choose r = 2, r is even. Choose r = 3, r is odd. Insufficient.

(2) Choose r = 4. r is even. Choose r = 5. r is odd. Insufficient.

(1)+(2) Since 2 is the only even prime number, and the range of r given in (2) excludes 2, then r must be odd. You can answer the question, "Is r even?" The answer is no.

The answer is C. Where is this problem from?
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by p2pg » Sat May 30, 2009 10:34 am
Thanks. Its from GMAT ExamPrep - Pearson Education.
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by rahulg83 » Sat May 30, 2009 10:37 am
definite C..without doubt
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