$S_n = a_1 + a_2 + a_3 + \cdots + a_n$
Now, let's substitute the formula for $a_n$ into the sum:
$S_n = \left(\frac{1}{1} - \frac{1}{2}\right) + \left(\frac{1}{2} - \frac{1}{3}\right) + \left(\frac{1}{3} - \frac{1}{4}\right) + \cdots + \left(\frac{1}{n} -
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