MathDB

153

Part of 1971 All Soviet Union Mathematical Olympiad

Problems(1)

ASU 153 All Soviet Union MO 1971 two of 25 such other 23 different from +,-

Source:

7/3/2019
Given 2525 different positive numbers. Prove that you can choose two of them such, that none of the other numbers equals neither to the sum nor to the difference between the chosen numbers.
combinatorics