The concepts of detour d-critical graphs, detour d-decreasing graphs, detour d-increasing graphs, detour d-changing graphs and detour diameter minimal graphs are introduced by Linda J. P and M. S. Sunitha in [7]. In this paper a characterization of detour d-changing graphs is obtained. The concepts of detour trail number and detour number are introduced. Then detour trail number and detour number of some well known graphs are obtained.
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