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jaydeer44
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 Posted: Fri Mar 21, 2008 5:19 pm Post subject: Another GMAT Prep Question |
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Does anyone know how to solve this GmatPrep DS Problem?
If n is a positive integer and r is the remainder when 4 + 7n is divided by 3, what is the value of r?
(1) n + 1 is divisible by 3.
(2) n > 20
The answer is A. |
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xeqtr
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Joined: 15 Mar 2008
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Location: istanbul
Test Date: April I hope
Target GMAT Score: 720
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| Posted: Fri Mar 21, 2008 5:34 pm Post subject: |
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statement 1: n + 1 divisible by 3. 7 x (n + 1) divisible by 3 as well.
7n + 7 - 3 = 7n + 4, since you substracted 3, 7n + 4 is divisible by 3, making the remainder r = 0.
statement 2: no help to identify value of r.
so QA is A. |
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