$a b - a - b + 1 = ? (a) (a - 1) (b - 1) (b) (1 - a) (1 - b) (c) (a - 1) (1 - b) (d) (1 - a) (b - 1)$

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Solution

$a b - a - b + 1 = a (b - 1) - 1 (b - 1) = (b - 1) (a - 1)$

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