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<p>[QUOTE=&quot;Numbers, post: 939658, member: 11668&quot;]It&#039;s not that hard, really.&nbsp; For example, the last three digits of a serial number can be anything from 000 to 999, so there are 1000 possibilities, and one of them is 666.&nbsp; So one out of every 1000 notes will have a serial ending in 666.</p><p>&nbsp;</p><p>Now, the 666 doesn&#039;t *have* to fall at the *end* of the serial number; there are actually six different positions within the serial where it could appear:</p><p>&nbsp;</p><p>xxxxx666&nbsp; xx666xx</p><p>xxxx666x&nbsp; x666xxx</p><p>xxx666xx&nbsp; 666xxxx</p><p>&nbsp;</p><p>So we can estimate that about 6 in every 1000 notes will have 666 in the serial number somewhere.</p><p>&nbsp;</p><p>In fact, however, this is an overestimate.&nbsp; Some notes will actually contain 666 more than once (in the extreme case, 66666666 contains it all six times, overlapping one another).&nbsp; So the percentage of serials that contain 666 will be a bit smaller than six per 1000, since those multi-666 serials got double-counted (or worse) in the estimated calculation.[/QUOTE]</p><p><br /></p>

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