Tick (✓) the correct answer:
ab − mn + an − bm = ?
(a) (a − b)(m − n)
(b) (a − m)(b + n)
(c) (a − n)(m + b)
(d) (m − a)(n − b)
$a b-m n+a n-b m$
$=a b+a n-m n-b m$
$=a(b+n)-m(n+b)$
$=(a-m)(b+n)$
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