5616

5016

5916

None of these

8421 code

excess 3 code

2421 code

5211 code

number of 1's is divisible by 3

number of 0's is divisible by 3

(c) number of 1's of is divisible by 6

(a) difference of alternate sum, i.e. a0 + a2 +.........- (a1 + a2 + ...) is divisible by 3

1010

1001

No such number exists

None of these

1010

101

1000

1001