14. If the two-digit integers M and N are positive and have the same digits, but in reverse order, which of the following CANNOT be the sum of M and N ?
y is OA A here
The 2 mumbers can be represented as (10x+y) and (10y+x).
Their sum would then be 11(x+y) and, hence, must be divisible by 11.
181 is the only choice not divisible by 11. Hence, A is the answer.