An that is incorrect it has nothing to do with my lack of understanding.
The chance to get one item is ALWAYS equal to other items. Under pure random.
You can be an idiot and say that X item had a 0.XXXX% chance of being picked multiple times but you an idiot for doing so.
Because that is theoretical BS.
The truth is that it had the SAME chance as other items but was roll because the RNG system DOES NOT FAVOUR one outcome over another outcome.
What is showing people do not UNDERSTAND what RANDOM means.
What they think should be happening isn't actually random. I would be worried if we kept getting different items every week because that might be that someone or something is at work behind the scenes and it wouldn't be true random. What is a big important thing as we have very few number of exotics in game atm and that furthers this kind of outcome.
This is why adding New Items or Outcomes to a Pure random system actually decreases the chance one item has of occurring.
E.g. with
4 possible outcomes
Each item has 25% chance to happen
8 outcomes is
12.5% chance to happen
10 outcomes is
10% chance to happen
You can run the equation to the infinite but the chance never chances because the equation doesn't value or weight one outcome over another.
Human Bias (the people posting) value one outcome over another because they lack the key understanding of basic maths.
That Mathbot Xur cares not about he gives you random items regardless.
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So if Voidfang has a 1/6th chance(or whatever it is) of being for sale, what is the chance that it will be sold 4 times in a row? From your post, I feel like you're saying it is still a 1/6th chance.