In \\\\(XeO_2F_2\\\\), there exists one \\\\(2\\ (n)\\\\)-fold axis of symmetry, while in \\\\(XeO_2F_4\\\\), there exists four \\\\((m)\\\\) \\\\(2\\\\)-fold axis of symmetry. The structures are given in the figure. Hence, \\\\(n = 2\\\\) and \\\\(m = 4\\\\).Therefore, \\\\(n+m=2+4=6\\\\)