CYCLIC INEQUALITY-687 Posted on December 28, 2019 by ssmrmh Proposed by Nguyen Van Canh-Ben Tre-Vietnam CYCLIC INEQUALITY-687 Solution 1 by Rahim Shahbazov-Baku-Azerbaijan, Solution 2 by Sanong Huayrerai-Nakon Pathom-Thailand, Solution 3 by Marian Ursarescu-Romania, Solution 4 by Michael Sterghiou-Greece