A bag contains red, blue and green balls. Without looking, what is the minimum number of balls that must be picked to guarantee getting two balls of the same colour?
- A.2
- B.3
- C.4 ✓
- D.5
Explanation: In the worst case, the first 3 picks could be one of each colour. The 4th pick must repeat a colour.
Class 6 IMO Mathematics Olympiad practice · HOTS / Achievers · Multi-Concept Achievers
← All Multi-Concept Achievers questions