• 3 Posts
  • 26 Comments
Joined 1 year ago
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Cake day: August 6th, 2023

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  • Once, I made an account for something that let me write my own security question and answer. I thought that was much better than the usual options and wrote something that cryptically referenced a difficult problem I once worked on. The answer could possibly be found online, but only to someone who properly understood the question. Later, when I needed to authenticate myself again, I got my security question. The answer isn’t something you typically memorize, but I knew what the prompt meant and how to work it out so I did so.

    But I was too slow. Apparently you had to answer within one minute. It took me about ten so it locked me out. Tech support helpfully reset my password after merely verifying my phone number and SSN which are probably known to thousands.



  • I see some correct solutions for the 50% case here already, so this reply is going for a perfect score within two tries.

    There are 16 ways to answer the quiz, one of which is correct. Assuming you don’t repeat your previous answers, two attempts give you a 2/16 or 1/8 chance that one of them is perfect.

    Now if you get feedback between your attempts, you should be able to do better. Let’s see by how much and break it into cases:

    1. Your first guess is already perfect. This happens 1/16 of the time. No further guessing is needed.

    2. Your first guess is 50% correct. This happens 3/8 of the time. Picking one of the unguessed answers improves your score to 100% 1/6 of the time.

    3. Your first guess is completely wrong. This happens 9/16 of the time. Picking different answers for both questions wins 1/9 of the time.

    So the overall chance of a perfect score is the weighted sum of these cases or 1/16 + (3/8 * 1/6) + (9/16 * 1/9) = 3/16.





  • Seems simpler for the good people of Wisconsin to just vote on a new law that says whatever they think is proper. Obstetric science has advanced somewhat since the time when Ignaz Semmelweis first proposed doctors washing their hands before delivering babies (especially if they’d just come form the cadaver lab), so some of the reasoning behind the 1849 law might be out of date.

    Unfortunately, that would require certain politicians to go on record about something that might be used against them if they later ran a national campaign, so better to let the court take the matter out of their hands and (mis-?)interpret an old law in a politically advantageous way.