How many of the following numbers are divisible by 3 but not by 9? 2133, 2343, 3474, 4131, 5286, 5340, 6336, 7347, 8115, 9276

Question

Accepted Answer

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.

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