1.

\[\frac{\left( 1-\frac{1}{4} \right)\left( 1-\frac{1}{5} \right)\left( 1-\frac{1}{6} \right)\left( 1+\frac{1}{4} \right)\left( 1+\frac{1}{5} \right)\left( 1+\frac{1}{6} \right)}{\left( 1-\frac{1}{2} \right)\left( 1-\frac{1}{3} \right)\left( 1-\frac{1}{4} \right)\left( 1+\frac{1}{2} \right)\left( 1+\frac{1}{3} \right)\left( 1+\frac{1}{4} \right)}=?\]

A. \[1\frac{87}{256}\]                               
B.  \[1\frac{86}{257}\]
C. \[2\frac{86}{4}\]                       
D. \[0\]
Answer» B.  \[1\frac{86}{257}\]


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