defence exam DGAFMS Group C 2025 Mock Test Series Quantitative Aptitude Number System Divisibility and Remainder
A number is divisible by 3 only when:
1
the difference of the sum of the odd and the even digits is divisible by 3
2
the sum of its digits is divisible by 3
3
the last digit is either 0 or an even number
4
the last two digits are divisible by 3