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<p>[QUOTE=&quot;Numbers, post: 2325552, member: 11668&quot;]It actually works out to about 1.8% of all bills.&nbsp; So not exactly common as dirt, but much more common than something like a radar serial (0.01% of all bills).</p><p><br /></p><p>If you want the math: To make all the digits different, the first digit can be anything (10 choices), the second digit can be anything different from the first digit (9 choices), the third digit can be anything different from the first two (8 choices), and so on until the 8th digit has only 3 choices.&nbsp; So the number of possible serials with all different digits is</p><p><br /></p><p>10 x 9 x 8 x 7 x 6 x 5 x 4 x 3 = 1,814,400</p><p><br /></p><p>and if you divide that by the total 100,000,000 possible serial numbers, you get 1.8%.[/QUOTE]</p><p><br /></p>

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