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1. $a^{2} - 1 + 2 b - b^{2}$

A. $(a + b + 1) (a - b + 1)$
B. $(a + b + 1) (a - b + 1)$
C. $(a + b + 1) (a - b + 1)$
D. $(a + b + 1) (a - b + 1)$

Answer: Option D

Explanation:

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