min no of calls for all 6 gossips to share the news
Source: 1998 Belarus TST 2.1
December 25, 2020
combinatorics
Problem Statement
Any of gossips has her own news. From time to time one of them makes a telephone call to some other gossip and they discuss fill the news they know. What the minimum number of the calls is necessary so as (for) all of them to know all the news?