Question

The factorisation of ab – a – b + 1 is

(a) (a – 1)(b – 1)

(b) (a + 1)(b + 1)

(c) (a – 1)(b + 1)

(d) (a + 1)(b – 1

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Answer 1

Answer:

$ab - a - b + 1$

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

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

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