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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?

 

Please email your answers to deputy-director[at]newton.ac[dot]uk and remember to include your name (or the name of the group that you solved the puzzle with) so that we can publish it on our website if you are one of the first few to successfully solve the problem.  

Answers to all puzzles will be published at the end of the month. 

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