Factorise the following expressions:-
$x y - a b (x + y) + a^{2} b^{2}$

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Solution

$x y - a b (x + y) + a^{2} b^{2}$
$\Rightarrow x y - a b x - a b y + a^{2} b^{2}$
$\Rightarrow x (y - a b) - a b (y - a b)$
$\Rightarrow (y - a b) (x - a b)$

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