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Another GMAT Prep Question

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Another GMAT Prep Question

by jaydeer44 » Fri Mar 21, 2008 4:19 pm
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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Source: — Data Sufficiency |
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by xeqtr » Fri Mar 21, 2008 4:34 pm
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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