Abstract
Among the problems of classical theory of probability, it is problem of the duration that is one of the most difficult problems to solve. Many distinguished mathematicians have grappled with this problem. I.Todhunter detailed the history of this problem in his book, A history of the mathematical theory of probability from the time of Pascal to that of Laplace, But, here is an excellent author that the erudite Todhunter does not discuss with respect to this problem. Andi・ Marie Ampere today is well known as a phisician. The misunderstanding that the name Ampere is not connected with the problem of the duration of play may be that Todhunter does not refer to his study. I examined the contribution of Ampgre to this problem in this article.
