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Factor of $$ {ab-a-b+1}$$ is
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1.	Factor of $$ {ab-a-b+1}$$ is
A.	(a-1)(b-1)
B.	(a+1)(b-1)
C.	(a-1)(b+1)
D.	(a+b)(b-1)
Answer» B. (a+1)(b-1)

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