Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 1995/06/25 Vol. E78-ANo. 6pp. 680-684 Type of Manuscript: Special Section PAPER (Special Section of Papers Selected from 1994 Joint Technical Conference on Circuits/Systems, Computers and Communications (JTC-CSCC '94)) Category: Keyword: consecutive 2-out-of-r-from-n: F system,exact solution, recursive equation,