Answer:
3,6,9
Step-by-step explanation:
If any number is divisible by 3, then it's sum should be divisible by 3
So, in a4b2, a+b+4+2 should be divisible by 3
Hence a+b+6 should be divisible by 3
Hence a+b should be divisible by 3 as 6 is already divisible by 3
Hence a+b can be 3,6,9 [It can go above that as a and b are single digit numbers]
