Here's a fun math challenge on Quora: Find the number of 6-digit numbers made up of the digits 1, 2, and 3 which have no digit recurring three or more times, consecutively?
The link to my answer on Quora is: https://goo.gl/BzBDQe Skip Cave Cave Consulting LLC ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
