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My $1 bill has no repeating decimals in its serial number
(sh.itjust.works)
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this post was submitted on 04 Jun 2026
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Mildly Interesting
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This is obviously an objective criteria, so the mods are always right. Or maybe mildly right? Ahh.. what do we know?
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If I remember high school math correctly, The first digit can be anything so, 10/10 options, the second digit cant be be the first so only 9/10 options, then 8/10 for the third, continue this pattern for each digit and multiply together you get 1.8% chance.
10 x 9 x 8... etc. yields 1,814,400 possible combinations of no repeats, right? I'm confused what the "whole" is if this is expressed as a percent.
100 000 000, the number of possible serial numbers.
Aha, that makes sense. Thanks.