[tex] \frac{3}{19} + \frac{7}{19} + \frac{8}{19} = \frac{18}{19} [/tex]
[tex] \frac{1}{5} + \frac{2}{5} = \frac{3}{5} [/tex]
[tex] \frac{2}{11} + \frac{3}{11} + \frac{4}{11} = \frac{9}{11} [/tex]
[tex] \frac{2}{7} + \frac{3}{7} = \frac{5}{7} [/tex]
[tex] \frac{11}{137} + \frac{29}{137} + \frac{97}{137} = \frac{137}{137} =1
[/tex]
