PDF chapter test TRY NOW

Which of the following statement is incorrect?
 
(a) \frac{1}{2} > \frac{1}{3}
 
(b) \frac{7}{8} > \frac{6}{7}
 
(c) \frac{8}{9} < \frac{9}{10}
 
(d) \frac{10}{11} < \frac{9}{10}