Assuming there are an infinite supply of coins, what is the fewest number of coins would be required in order to make sure each and every coin touched exactly three other coins?

8 comments for “Coins

  1. Twisted Root
    January 28, 2019 at 18:16


    • January 28, 2019 at 18:25


      • Twisted Root
        January 28, 2019 at 22:04

        You mean I got one right?

  2. Ed P
    January 28, 2019 at 19:34

    Yes, four, placed in a tetrahedron shape.

  3. Mark in Mayenne
    January 28, 2019 at 20:20

    Rats! Too late!

  4. January 29, 2019 at 04:50

    Yes, you got one right. Maybe more than one. 🙂

  5. Lord T
    January 29, 2019 at 13:51

    Can I see a picture please as I do not think it is possible using UK currency.

    • January 29, 2019 at 18:57

      Try it for us and report your findings.

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