TOT 293 1991 Spring O S3 a, b -> a+b+ab, last no from 100 remaining
Source:
June 9, 2024
algebranumber theorycombinatorics
Problem Statement
numbers , , , , are written on the blackboard. One may delete two arbitrary numbers and among them and replace them by the number . After such operations only one number is left. What is this final number?(D. Fomin, Leningrad)