Question:
Tick (✓) the correct answer:
ab − a − b + 1 = ?
(a) (a − 1)(b − 1)
(b) (1 − a)(1 − b)
(c) (a − 1)(1 − b)
(d) (1 − a)(b − 1)
Solution:
(a) (a − 1)(b − 1)
$a b-a-b+1$
$=a(b-1)-1(b-1)$
$=(a-1)(b-1)$
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