Aptitude - Numbers - Discussion
Discussion Forum : Numbers - General Questions (Q.No. 34)
34.
How many of the following numbers are divisible by 3 but not by 9 ?
2133, 2343, 3474, 4131, 5286, 5340, 6336, 7347, 8115, 9276
2133, 2343, 3474, 4131, 5286, 5340, 6336, 7347, 8115, 9276
Answer: Option
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 
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.
Discussion:
13 comments Page 2 of 2.
Roobi said:
4 years ago
@Ajax.
It's quite easy to understand. Thanks.
It's quite easy to understand. Thanks.
(1)
Mr.Prakash said:
4 years ago
Thank you very much @Ram,
Very helpful solution.
Very helpful solution.
Devesh Kinkar said:
6 months ago
@All.
Shortcut Trick:
A number is divisible by 3 if the sum of its digits is divisible by 3.
A number is divisible by 9 if the sum of its digits is divisible by 9.
Shortcut Trick:
A number is divisible by 3 if the sum of its digits is divisible by 3.
A number is divisible by 9 if the sum of its digits is divisible by 9.
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