Answer
$\frac{1}{100}$
Work Step by Step
$(\frac{2}{5}-\frac{3}{10})^{2}$
$=(\frac{4}{10}-\frac{3}{10})^{2}$
$=(\frac{1}{10})^{2}$
$=(\frac{1}{10}\times\frac{1}{10})$
$=\frac{1}{100}$
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