Simple Trick To Improve Your Passcode

There's a simple trick that could make your passcode harder to guess. Thanks to Robbie and Aman for suggesting this topic! Special thanks this month to: Daniel Lewis, Lee Redden, Kyle. Thanks to all supporters on Patreon and YouTube!
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0:00 4 digits
4:09 6 digits
10:08 general case

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4 digits used in 6 passcode
https://chatgpt.com/s/t_68f73d30e260819185b50a144c408c5a
3 digits used in 6 passcode
https://chatgpt.com/s/t_68f73d1bc074819183642bbd9a664223
general formula
https://chatgpt.com/s/t_68f6c761f6048191b25eb65cd25f65b2
OEIS
https://oeis.org/A019538
Math StackExchange
https://math.stackexchange.com/questions/1143821/should-i-have-a-repeated-digit-in-a-4-digit-pin-code


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