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Numbers - General Aptitude

Q1:

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

A 5

B 6

C 7

D None of these

ANS:B - 6

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.