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6. Reduce the expression by rationalising it

\frac{5}{15 + \sqrt{13}}

\(=\) ____________

$\frac{5 (15 + \sqrt{13})}{212}$
$\frac{5 (15 + \sqrt{13})}{13}$
$\frac{5 (15 - \sqrt{13})}{15}$
$\frac{5 (15 - \sqrt{13})}{212}$

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