Previous Year Questions

For option (a) and (d): the sum of digit of the number must be divisible by 3 and 9 respectively,

2+9+1+8+2+4+5 = 31, not divisible by both 3 and 9.

For option (b): difference between sum of digit on odd place and sum of digit on even place.

(9+8+4) - (2+1+2+5) = 11, divisible by 11.

For option (c): since the given number is odd, hence it is not divisible by 12.

Hence, option (b) is correct.