How many of the following numbers are divisible by 3 but not by 9 ?
2133, 2343, 3474, 4131, 5286, 5340, 6336, 7347, 8115, 9276	Choose the correct answer.
A) 5  B) 6  C) 7  D) 8  E) 9
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 9 (X)   2343 12 (/)   3474 18 (X)   4131 9 (X)   5286 21 (/)   5340 12 (/)   6336 18 (X)   7347 21 (/)   8115 15 (/)   9276 24 (/)   Required number of numbers = 6.   Answer: 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