Getting the voidfang vestments is 16.66% every week regardless of what happened the previous week so your assumption of taking it to the 4th power is a false assumption. If I flip a coin and it's heads, is the next flip still not a 50/50 chance? I learned this principle in college Statistics.
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No I'm calculating the probability of continuously getting the same result over a period of trials, not of the likely-hood of it being here this week.
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Which isn't useful or statistically significant information, mutually exclusive variables are in fact just that, mutually exclusive.