Abstract
In this paper we discuses the periodic solutions of particular cases of the following general system of difference equations
x(n+1) = y(n-a1)/x(n-a2)z(n-a3), y(n+1) = z(n-a4)/x(n-a5)y(n-a6), z(n+1) = x(n-a7)/y(n-a8)z(n-a9),
where the initial conditions are arbitrary nonzero real numbers and a(i) are non-negative integer numbers.