HP. Happy Root 10 Day!

For procrastinators only, we celebrate √10 day! And we pose a new puzzle:

The number of 1’s in this quiz is ____

The number of 2’s in this quiz is ____

The number of 3’s in this quiz is ____

The number of 4’s in this quiz is ____

There are actually two solutions to this one, but more generally, what happens with more lines in the quiz?

Finally, here’s the link to the special issue of Nature with essays on the great Alan Turing.


  1. martin said,

    March 17, 2012 at 3:42 pm

    I wrote a python program to simulate 5 (not 100) ppl getting on the plane.

    the last guy  gets his seat about 0.499045  of the time.


  2. Shawn said,

    March 19, 2012 at 1:25 am

    Show Spoiler ▼

  3. gpeace said,

    March 22, 2012 at 8:39 pm

    I found Show Spoiler ▼

  4. Brett Barbaro said,

    July 18, 2012 at 11:33 am

    Hey! Episode HP is broken – I can only download 2.3MB worth. Any chance of getting it fixed? I can’t stand to miss even a second of your amazing show! :)

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