combinatorics
Source:
February 20, 2016
combinatorics
Problem Statement
is a positive integer. company has a special method to sell clocks. Every customer can reason with two customers after he has bought a clock himself it's not allowed to reason with an agreed person. These new customers can reason with other two persons and it goes like this.. If both of the customers agreed by a person could play a role (it can be directly or not) in buying clocks by at least customers, this person gets a present. Prove that, if persons have bought clocks, then at most presents have been accepted.