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<p>pattern, as a <a href="page.php?w=function_%28mathematics%29">function</a> of their place in the sequence. For simple patterns, summation of long sequences may be represented with most summands replaced by ellipses. For example, summation of the first 100 <a href="page.php?w=natural_number">natural number</a>s may be written as . Otherwise, summation is denoted by using ? notation, where  is an enlarged capital <a href="page.php?w=Greek_letter">Greek letter</a> <a href="page.php?w=sigma">sigma</a>. For example, the sum of the first  natural numbers</p><p>
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