## Problem of the Week 1187## Find the Head-Averse CoinWe have two coins: coin A gives heads with probability 1/3; coin B gives heads with probability 9/10. One of the two, call it C, is selected randomly (using equal probability).
Devise a scheme that involves flipping C at most n times, looking at the results, and declaring whether Source: Suggested by Michael Elgersma Aside: One could imagine a different method of gathering evidence, where one flips one of them m times and the other n times, trying to minimize the total number of flips. I have not thought about that. © Copyright 2014 Stan Wagon. Reproduced with permission. |

7 August 2014