Delta-K,  Teaching Ideas,  Volume 37, Issue 2

An Enigmatic E-Mail Riddle with an Explanation Using Modular Arithmetic

Journal of the Mathematics Council of the Alberta Teachers’ Association

Volume 37 Issue 2, June 2000

54 – 55

An Enigmatic E-Mail Riddle with an Explanation Using Modular Arithmetic

Murray Lauber

The following riddle was circulated by e-mail at Augustana University College by Tom Bateman of the political studies department. Perhaps you have already encountered it.