question_answer

The product of given 11 fractions is: \[\left( 1-\frac{1}{18} \right)\left( 1-\frac{1}{19} \right)\left( 1-\frac{1}{20} \right)\left( 1-\frac{1}{21} \right).......\left( 1-\frac{1}{28} \right)\]

A)  \[\frac{18}{28}\]                                  

B)  \[\frac{17}{28}\]

C)  \[\frac{19}{28}\]                                  

D)  \[\frac{31}{28}\]

E)  None of these