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1. $x^{2} - y^{2} + 2 y - 1$

A. $x + y + 1$
B. $x + y + 1$
C. $x + y + 1$
D. $x + y + 1$

Answer: Option C

Explanation:

x²-y²+2y-1
=y²-2y+1-x²
=(y-1)²-x²
=(x+y-1)(y-1-x)
(ans)

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