Question:
If the sum of digits of a number is divisible by three, then the number is always divisible by
(a) 2
(b) 3
(c) 6
(d) 9
Solution:
(b) We know that, if sum of digits of a number is divisible by three, then the number must be divisible by 3, i.e. the remainder obtained by dividing the
number by 3 is same as the remainder obtained by dividing the sum of its digits by 3.