1.

\[3\frac{1}{2}+2\frac{5}{7}\times \frac{9}{26}\times 2\frac{1}{2}\div 2=\_\_\_\_\]

A.  \[\frac{491}{728}\]        
B.  \[\frac{4}{728}\]
C.  \[4\frac{491}{728}\]      
D. none of these
Answer» D. none of these


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