26 authentic coins from 105 totally, 3 fake
Source: I May Olympiad (Olimpiada de Mayo) 1995 L2 P5
September 17, 2022
combinatoricsgame
Problem Statement
We have coins, among which we know that there are three fake ones. Authentic coins have all the same weight, which is greater than that of the false ones, which also have the same weight. Determine from can authentic coins be selected by weighing only two in one two pan balance.