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1. 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?
- A. 181
- B. 181
- C. 181
- D. 181
Answer: Option A
Explanation:
Let the first digit be xy, then the second digit would be yx.
xy = 10x + y
yx = 10y + x
sum = 11 (x+y)
so the sum has to be multiple of 11. 181 is not. so 181 be the answer
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