1.

The common factors of 18 and 27 are_____.

A. \[1,3,6,9\]       
B.            \[1,3,9\]
C. \[1,2,3,9\]              
D.    \[1,3,9,18\]
E. None of these
Answer» C. \[1,2,3,9\]              


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