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IKMC 2012 - Grades 9-10 - Self-study Question 26

IKMC · IKMC 2012 - Grades 9-10 - Self-study

Question 26

Five lamps start off. Each operation switches one chosen lamp and exactly one other randomly chosen lamp. After 10 operations, which statement is true?
  1. All off is impossible
  2. All definitely on
  3. All on is impossible
  4. All definitely off
  5. None of A–D