A number is divisible by 11 if the difference of sums of even and odd places is 0 or a multiple of 11
Question 148
Fill in the blank to make the statement true.
If the difference between the sum of digits at odd places (from the right) and the sum of digits at even places (from the right) of a number is either 0 or divisible by ___, then the number is divisible by 11.