The chances of him being Rng are astronomical.
The proof: Voidfang vestments
There are 6 types of armor exotics for the Warlock: 1/6 chance of getting the voidfangs, or roughly 16.66%
Now to get the probability of this happening 4 times in a row, we simply take 0.1666 (16.66% in its decimal form) and put it to the power of 4.
So what does 0.1666 * 0.1666 * 0.1666 * 0.1666 get us: 0.0007703
Now converting 0.0007703 to a percent we get: 0.07703% chance (roughly) of getting the voidfang 4 WEEKS IN A ROW.
I'M SPEAKING OF THE MATH OF GETTING IT FOUR WEEKS IN A ROW NOT ON A WEEK BY WEEK BASIS.
We can from this data assume that Xur is not RNG.
Conclusion: Bungie enjoys taking baths in the salty tears of Warlocks.
Edit: Well a few people seem to have a problem with my math, so if you do, would you mind posting something correct. Aswell as I did not take into account that some items may be weighted more then others.
Edit 2: In response to everyone saying that I was to quick to jump the gun that Xur is not RNG, well you are right, there is still a chance that it may of in fact happened, but i stand by the fact that there is a 0.07703% chance of this happening, so i assumed that this would not of happened.
Edit 3: Number 1: Yay look at us being all fancy and trending
Edit 4: Trying to maybe sleep but so many buzzing phone notifications
Edit 5: someone brought up the point that one of the multiple factors may be to decide between arms, chest, and helm, then decide between exotics which does make some sense for the sun-breakers incident.
but this brings the chances down even lower: around 0.01928125% chance
Edit 6: If anyone from bungie reads this would you be able to confirm or deny the randomness of Xur?
Edit 7: back from school
Edit 8: It has come to my attention that some people may be misunderstanding my work, I'm not saying the probability of him getting the voidfang this week is 0.077% I'm saying the probability that he were to sell Voidfang 4 weeks in a row is 0.077% (Assuming he sells all exotic armor, and that all are weighted evenly, which i either believe some are weighted more, or its pre-chosen!)
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Edited by X CARLO GUTI X: 11/28/2014 8:56:46 PMIn my personal humble opinion, I'm certain to myself that Xûr is not RNG by any means. I believe in totality that xûr's inventory is pre chosen. Just by using real life logic anyone can deduce it's not RNG based. How many times a weapon has been sold twice? 3 times only...red death, truth(twice in short time) and suros regime. If it was really RNG we would probably by now had a weapon sold about 3 to 4 times. What a coincidence that xûr has yet to sell only what? 3 more weapons? (Correct me if wrong on this) that's it? He's about to be done selling all exotic weapons mmm....what a coincidence...NOT. Use your logic people. The armor on the other hand it's more limited for each character so we see the same armor over and over again. Yet for warlocks xûr just can't sell anything other than voidfangs and Sunbreakers....mmmm...what a coincidence...NOT. also for the very first time he sold last week the hunter gauntlets...wonder why until now...not a coincidence. Same goes for the no back up plans for titans...only sold once before sold again last week. When everyone in the community is begging for those 2 gauntlets. This whole xûr thing is just pre chosen by a team. Whoever doesn't want to open their eyes...to each their own. Obviously bungie trying to make the armor less accessible. Helmets too have been a bit difficult to come by...that's why xûr also sells engrams. Which then again bungie made it hard with the engrams being random for each class...this to make you think about creating a new class and play the game more. XÛR IS NOT RNG...PERIOD! Edit 1: By the way just want to clarify that I have nothing against xûr...I love xûr and I love destiny. Just want people to open their eyes, xûr is not RNG based...it's pre chosen!