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Summer Maths Puzzles - Tuesday 20 August - adnRmo Ordering

adnRmo Ordering

6 cards numbered from 1 up to 6 are placed at random in a straight line.

What is the probability that for each pair of neighbouring cards, one is a multiple of the other?

 

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University of Cambridge Research Councils UK
    Clay Mathematics Institute London Mathematical Society NM Rothschild and Sons