Post subject: GMAT Number Theory (Data Sufficiency)
Posted: Wed Aug 19, 2009 6:00 am
Joined: Sun Apr 19, 2009 6:56 pm Posts: 32
Does r have exactly four distinct positive factors?
(1) r is the product of two numbers, each of them prime numbers. (2) r = 57
r could be the product of 2 x 2 because the question doesn't say whether the two prime numbers are distinct or not. When the two numbers are the same r has 3 not 4 factors. (1, 2,4) Therefore the answer must be (B) not (D)
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