GRE Problem Solving Question 645
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Source: Magoosh
M is a positive two-digit number. When the digits are reversed, the number is N. If K = M + N, which of the following is true?
- A K must be even
- B K cannot be square
- C K cannot be divisible by 13
- D K must be divisible by 11
- E If M is even then K must be even