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DS: Primes #1

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by alex.gellatly » Sun Sep 02, 2012 7:28 pm
saintforlife wrote:Does the integer x have 3 or more distinct positive factors?
(1) x is odd
(2) 23<x<29
The correct answer is B and here's why:

The question stem asks if x has 3 or more different positive factors. This will happen when x is not prime.

1. x is odd. x could be any integer, prime or not prime. Insufficient
2. 23<x<29 the only integers here are 24,25,26,27,28. There are no prime numbers and thus this is sufficient.
A useful website I found that has every quant OG video explanation:

https://www.beatthegmat.com/useful-websi ... tml#475231
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