The Johnson's rule can be extended to 3 machines and n jobs flow shop scheduling problem, if one of the following conditions is satisfied:

(a) minimum processing time on machine 1 is more than the minimum processing time on machine 2 or maximum processing time on machine 3 is more than the minimum processing time on machine 2

(b) maximum processing time on machine 1 is more than the minimum processing time on machine 2 or maximum processing time on machine 3 is more than the maximum processing time on machine 2

(c) maximum processing time on machine 1 is more than the minimum processing time on machine 2 or maximum processing time on machine 3 is more than the minimum processing time on machine 2

(d) None of the above AppendixLO1