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IMC 2010 Q8

IMCCurrent spec5 marksCounting, Probability & LogicRatio, Rates & Measures

8. On my clock's display, the time has just changed to 02:31. How many minutes will it be until all the digits 0, 1, 2, 3 next appear together again?

  1. A 1
  2. B 41
  3. C 50
  4. D 60
  5. E 61

Intermediate Mathematical Challenge 2010, Question 8. © UK Mathematics Trust. Original paper on ukmt.org.uk

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