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<p>[QUOTE=&quot;-jeffB, post: 3293877, member: 27832&quot;]My combinatorics knowledge is pretty dusty, so I&#039;m not sure what the odds are of finding an adjacent pair of digits in an 8-digit number. But out of 13 bills in my wallet right now, 7 have doubles, and one has a triple, so I&#039;m going to say they&#039;re really, <i>really</i> common.</p><p><br /></p><p>Out of the same 13 bills, one has two pairs, one has two adjacent two-digit repeats (7878), and two have overlapping repeats (89898).</p><p><br /></p><p>Our brains are really good at spotting patterns, and there are lots and lots of different patterns that can show up in a serial number. In fact, for <i>any</i> serial number, you can probably find <i>some</i> sort of pattern in it.</p><p><br /></p><p>The only ones interesting to collectors are the rare ones, though. And if you find a pattern in the first few bills you search, or find it several times in a small batch of bills, it&#039;s probably not rare![/QUOTE]</p><p><br /></p>

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