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IKMC 2005 - Grades 11-12 - Self-study Question 23

IKMC · IKMC 2005 - Grades 11-12 - Self-study

Question 23

The digit sum of an integer m is 30. Which cannot be the digit sum of m+3?
  1. 6
  2. 15
  3. 21
  4. 24
  5. 33