Factorise:
$m^{2} - 4 m n + 4 n^{2}$

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Solution

$m^{2} - 4 m n + 4 n^{2} = (m)^{2} - 2 \times m \times 2 n + (2 n)^{2} = (m - 2 n)^{2} A n s .$

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