1-2-3-4 Puzzle


Using the digits 1, 2, 3, 4 twice, form an eight-digit number in such a way that there is one digit between the 1’s, two digits between the 2’s, three digits between the 3’s and four digits between the 4’s. 


There are only two solutions: 23421314 or its reverse 41312432.

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My name Edmark M. Law. I work as a freelance writer, mainly writing about science and mathematics. I am an ardent hobbyist. I like to read, solve puzzles, play chess, make origami and play basketball. In addition, I dabble in magic, particularly card magic and other sleight-of-hand type magic. I live in Hong Kong. You can find me on Twitter` and Facebook. My email is edmarklaw@learnfunfacts.com

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