Writing numbers on a blackboard
Source: 2024 CTST P11
March 12, 2024
combinatorics
Problem Statement
There is number on the blackboard initially. The first step is to erase and write two nonnegative reals whose sum is . Call the smaller number of the two .
For integer , the the step is to erase a number on the blackboard arbitrarily and write two nonnegative reals whose sum is the number erased just now. Call the smallest number of the on the blackboard .
Find the maximum of .