• LapGoat@pawb.social
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    1 month ago

    if you were to pick randomly, the correct answer would change something you didnt pick.

    meaning the chances of a random selection picking the correct answer is zero.

    since your answer is not a random selection, you can input the answer as C.

  • CelloMike@lemmy.world
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    1 month ago

    B

    The four answers sum to 100%, so on average each answer has a 25% chance of being right, and 25% is two of the options so you have a 50% chance of picking one of those

    • Zwiebel@feddit.org
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      1 month ago

      But if 50% is the right answer then you only have a 25% chance of picking that one

    • ergonomic_importer@piefed.ca
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      1 month ago

      But if the correct answer is 50% and there is only 1/4 chance of choosing that answer at random, you then have a 25% chance of choosing it correctly. So the answer must be 25%, but there is 2/4 chance of choosing that at random so you have a 50% chance of choosing that correctly so the answer is 50%, but there is only a 1/4 chance of…

    • wintermute@discuss.tchncs.de
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      1 month ago

      What the question is asking for, is an answer where the value and the chance of choosing it at random are the same.

      None of the answers satisfy that condition, because you have a 50% chance of choosing 25%, a 25% chance of choosing 50% and a 25% chance of choosing 0%.
      None of the answers match the chance of choosing it.

    • Dettweiler@lemmy.dbzer0.com
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      1 month ago

      But two of those answers are the same, which reduces the number of possibilities to 3, and 33.3% isn’t an option.

      • magnetosphere@fedia.io
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        1 month ago

        That’s what’s messing with me, too. I am by no means a math genius, but that’s where I get stuck.

      • Tja@programming.dev
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        1 month ago

        It doesn’t reduce the numbet of possibilities. If you had 9999 true and 1 false, the chances are not 50/50

        • Dettweiler@lemmy.dbzer0.com
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          1 month ago

          25% chance that guessing an answer on a 4 answer question will be true. However, two of the answers say 25%, which is 50% of the possibilities, which now invalidates those answers from being correct. With only answer being correct, it invalidates 50% from being the right answer.

  • ShellMonkey@piefed.socdojo.com
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    1 month ago

    Well if I pick it at random the chances of typing one of those specific char strings into the keyboard is small enough to be effectively 0%

    Creative interpretation of the question is a valid test taking method

    • f314@lemmy.world
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      1 month ago

      This is a paper test, though… Not sure how your keyboard factors in to that 😅

      • ShellMonkey@piefed.socdojo.com
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        1 month ago

        Not paper to me, just a picture of paper. I suppose on paper circling a random small space would be fairly similar results though.

  • lemonhead2@lemmy.world
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    1 month ago

    if the correct answer is b or c, you would be right a quarter of the time

    if the correct answer is a or d you would be right half the time.

    athere are 3 correct answers. assuming the correct answer is chosen at random, you would be right 1/3x1/2 + 2/3x1/4 = 1/3 of the time

  • forbiddencherry@lemmy.today
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    1 month ago

    Going with D. It’d be 25% for a normal question, but since it’s the second 25% this provides some evidence that I read all the answers.

    • Soup@lemmy.world
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      1 month ago

      2 out of 4 answers are the same, and if we say that 25% is correct then you actually have a much higher chance of selecting the correct one. I’m sure there’s some statistics crap to say it’s not 50%, but if half your random choices are correct then that seems right to me. So now 50% is correct, but it’s only 1 in 4 and the odds go back to 25%. So now it’s 0%, except that that’s ALSO on there so now the correct answer is 25% again. The problem is that ever single time 25% becomes the correct answer you now have a 50% chance to get it right if chosen randomly and it’s wrong all over again.

      • forbiddencherry@lemmy.today
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        1 month ago

        Yep, that’s definitely the thought process the question-asker intended. I’m sidestepping that slightly: if an answer is chosen completely at random then one should be able to completely ignore the text of the question and answer, and roll a four-sided die, leading to 25%. I agree that strategy assumes that there’s a single correct answer. And the typical expectation of a multiple choice question is to only have a single correct answer. The question itself says “the answer” not “answer(s)”, that’s perhaps a partial support of the expectation of a single correct answer. But yes, my assumption that there’s only a single correct answer, while reasonable in general, could be considered flawed considering the nature of the question itself.

        • Soup@lemmy.world
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          1 month ago

          The text says “the answer” and 25% having two ways to get to it does not mean there are two answers. You can’t just say you’re avoiding assumptions and then make more assumptions that are even more outlandish.

          Ultimately, you can’t really side-step how impossible it is to answer it correctly. The answer is to write in “e) fuck off”

      • Warl0k3@lemmy.world
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        1 month ago

        Nono, see your chance of picking it at random is 0% because none of the answers are right - but if you pick it intentionally, then it’s the correct answer. galaxy brain meme

      • MoonManKipper@lemmy.world
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        1 month ago

        Which means I’m wrong and has no chance to get it right. All randomly picked answers are wrong. At least that’s how I’m breaking out of the infinite loop. Or there is just a typo…

  • bedwyr@piefed.ca
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    1 month ago

    We need to know the question do we not? OP failed here. The question could change the answer.

    • webghost0101@sopuli.xyz
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      1 month ago

      The question is quite clear

      “What is the % chance that you can guess the right answer on this multiple choice question”

      i just wish we knew the intended answer… assuming this isn’t fake.

      • wonderingwanderer@sopuli.xyz
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        1 month ago

        I think it’s actually 0%. Because it’s impossible to answer correctly.

        But wouldn’t that make the answer 25%? Which would make the answer 50%. Which would make the answer 25%. So you get stuck in an infinite loop, except that since that makes it impossible to answer, the paradox collapses, making the true answer 0%.

        Only… that would mean there’s a 25% chance of guessing it. But that means it’s still 0%… sorta?

        I feel like this question is more philosophical than mathematical…