Difference between revisions of "1983 IMO Problems/Problem 3"
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Revision as of 22:30, 31 January 2016
Let , and be positive integers, no two of which have a common divisor greater than . Show that $2abc − ab − bc − ca$ (Error compiling LaTeX. ! Package inputenc Error: Unicode char \u8:− not set up for use with LaTeX.) is the largest integer which cannot be expressed in the form ,where , and are non-negative integers