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Which of the following integers is NOT divisible by 3?

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Senior Manager
Joined: 20 May 2014
Posts: 263
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Kudos [?]: 31 [0], given: 181

Which of the following integers is NOT divisible by 3? [#permalink]  12 Nov 2017, 00:28
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Which of the following integers is NOT divisible by 3?

(A) 624

(B) 711

(C) 819

(D) 901

(E) 969

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[Reveal] Spoiler: OA
Director
Joined: 03 Sep 2017
Posts: 522
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Kudos [?]: 202 [0], given: 66

Re: Which of the following integers is NOT divisible by 3? [#permalink]  12 Nov 2017, 23:54
A fast way to check if an integer is divisible by 3 is to sum its digits and check if the result is divisible by 3.

It is easy to notice that choice D, 109, has digits summing to 10 that is not divisible by 3. Thus, 109 is not divisible by 3.

Re: Which of the following integers is NOT divisible by 3?   [#permalink] 12 Nov 2017, 23:54
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