ArithmeticWhich of the following number is divisible by “3” ?

Which of the following number is divisible by “3” ?

The number is divisibility by ‘3’ if and only if ,

The sum of its digit is divisible by 3 and the total number also divisible by by 3

The number 2781 , $2 + 7 + 8 + 1 = 18$

18 is divisible by 3 , the total number 2781 is also divisible by 3.