On Suborbital Graphs of the Congruence Subgroup r 0(N) Year: 2008 Volume: 2 Issue: 7 438 - 441 Pages Authors: Bahadir O. Guler Serkan Kader Murat Besenk Abstract: In this paper we examine some properties of suborbital graphs for the congruence subgroup r 0 (N) . Then we give necessary and sufficient conditions for graphs to have triangels. Keywords: Congruence subgroup Imprimitive action Modulargroup Suborbital graphs.