The positive two-digit integers m and n have the same digits, but in reverse order. Which of the following must be a factor of m + n?  Choose the correct choice from the following.
A) 33  B) 9  C) 10  D) 12  E) 14
Remember: When you take the difference between the two, it will always be 9. e.g 23-32=9, 89-98=9   and when you add both integers, the sum will always be a multiple of 11 e.g 23+32=55, 89+98= 187   33 is multiple of 11.   33nswer : 33
<result>A</result>
The positive two-digit integers m and n have the same digits, but in reverse order. Which of the following must be a factor of m + n?