That's the probable outcomes of future tosses though. Where as what I'm saying is the probability of the one toss or in this case the probable outcome of xur's inventory on any given Friday. (Not talking his probable inventory weeks ahead)
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That does not change the fact that the probability of the item appearing 4 times in a row (which is what has happened) is 1/6 to the power of 4 as illustrated by the wikipedia quote