Tick ( ) the correct answer: ab - a - b + 1 = ? - Vidyadip

MCQ

Tick $(\checkmark)$ the correct answer: $ab - a - b + 1 = ?$

✓
$(a - 1)(b - 1)$
B
$(1 - a)(1 - b)$
C
$(a - 1)(1 - b)$
D
$(1 - a)(b - 1)$

✓

Answer

Correct option: A.

$(a - 1)(b - 1)$

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

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