How many of the following numbers are divisible by 3 but not by 9 ?
2133, 2343, 3474, 4131, 5286, 5340, 6336, 7347, 8115, 9276
Answers:
A) 5	B) 6	C) 7	D) 8	E) None of these
Explanation:   Marking (/) those which are are divisible by 3 by not by 9 and the others by (X), by taking the sum of digits, we get:s   2133 -&gt; 9 (X)   2343 -&gt; 12 (/)   3474 -&gt; 18 (X)   4131 -&gt; 9 (X)   5286 -&gt;21 (/)   5340 -&gt; 12 (/)   6336 -&gt; 18 (X)   7347 -&gt; 21 (/)   8115 -&gt; 15 (/)   9276 -&gt; 24 (/)   Required number of numbers = 6.   ANSWER IS 6
<result>B</result>
How many of the following numbers are divisible by 3 but not by 9 ?
2133, 2343, 3474, 4131, 5286, 5340, 6336, 7347, 8115, 9276