1.

                From the following, which are the factors of \[{{a}^{2}}+b-ab-a\]?                  

A.  \[(a-1)\]and \[(a-b)\]             
B.  \[(a+b)\]and \[(a-1)\]     
C.  \[(a+1)\]and \[(a-b)\]     
D.  \[(a+b)\] and \[(a+1)\]                 
Answer» B.  \[(a+b)\]and \[(a-1)\]     


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