Groups and FieldsChallengeA Gallery of Groups ShareA Gallery of Groups · Challenge problemIn D7D_7D7, how many ordered pairs (x,y)(x,y)(x,y) of reflections satisfy xy=rxy=rxy=r, where rrr is the rotation by 360∘7\tfrac{360^\circ}77360∘?Check Show answer Walk through it step by step Practice more like this Review this concept