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

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

Answer: Option A

Explanation:

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