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IKMC 2017 — Grades 5–6 Question 26

IKMC · IKMC 2017 — Grades 5–6

Question 26

A bag contains only red marbles and green marbles. For any 5 marbles we pick, at least one is red; for any 6 marbles we pick, at least one is green. What is the largest possible number of marbles in that bag?
  1. 11
  2. 10
  3. 9
  4. 8
  5. 7