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

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