If you take a number, e.g. 141, and add up all its digits, you can find out if it's divisible by three.
So: 1+4+1 = 6
6 is a multiple of three, so 141 is also a multiple of three.
1 and 3.
No.
No
no
No.
NO.
2 & 3
It is divisible by 3.
Yes
Yes
2 and 3.
yes
3333