MCQ
The factorisation of $ab - a - b + 1$ is:
- ✓$(a - 1) (b - 1)$
- B$(a + 1) (b + 1)$
- C$(a - 1) (b + 1)$
- D$(a + 1) (b - 1)$
$= ab - a - b + 1$
$= a(b - 1) - 1(b - 1)$
$= (a - 1) (b - 1)$
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