Question

Prove that a positive integer is divisible by 3 if and only if sum of its digit is divisible by 3

Answer 1

Answer:

Step-by-step explanation: let the first number be 3and let the second number be 6 now 36/3=12and also 3/3=1 and 6/3=3

Answer 2

Answer:

yes this is true.

Step-by-step explanation:

for example -

1. 36 = 3+6 = 9 and 9 is divisible by 3 as well as 36 is also divisible by 3.
2. 12 is divisible by 3 and 1+2 = 3 which is divisible by 3.
3. 81is divisible by 3 and 8+1 = 9 which is divisible by 3.