Question 844111
2 - last digit divisible by 2.
3 - Add the digits, the sum must be divisible by 3.
4 - last 2 digits divisible by 4
5 - ends in 5 or 0
6 - divisible by 2 and 3
8 - last 3 digits divisible by 8?
9 - Add the digits, the sum must be divisible by 9.
10 - last digit is 0.
11 - Add the odd positions starting from left to right. Add the even positions starting from left to right. If the difference of the sums is zero or a multiple of 11, the number is divisible by 11.
a) 2, yes
3, no, sum is 10
4, yes, 12/4=3
5, no
6, no
8, no
9, no
10, no
11, no, difference in sums is (4+0+0+2)-(2+1+1)=6-4=2

Now do the same for b and c.