1.

Simplify : \[\left( \frac{3}{11}\times \frac{5}{6} \right)-\left( \frac{9}{12}\times \frac{4}{3} \right)+\left( \frac{5}{13}\times \frac{6}{15} \right)\]

A.  \[-\frac{177}{286}\] 
B.         \[-\frac{303}{40}\]   
C.         \[\frac{289}{492}\]   
D.         \[\frac{17}{24}\]       
Answer» B.         \[-\frac{303}{40}\]   


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