From recent to first.
27-Red Death
26-Ice Breaker
25-Universal Remote
24-No Land Beyond
23-Ice Breaker
22-Plan C
21-Dragons Breath
20-No Land Beyond
19-Ice Breaker
18-TLW
17-Dragon Breath
16-No Land Beyond
15-Patience and Time
14-Truth
13-Plan C
12- Plan C
11-Mida Tool
10-TLW
9-Truth
8- Patience and Time
7-Suros Regime
6-Truth
5-Ice Breaker
4-Red Death
3-Suros Regime
2-Ghorn
1-Red Death
Info:
1. Remove Exotic bounty weapons. (Thorn,pocket infinity,super good advice,bad juju,invective)
2. Remove rare weapons amd DLC exclusives for now. (Vex mythoclass,thunderlord,hard light) and (ps4 exclusives for now)
3. Higher probabilites could include weapons for next week(ghorn,truth,patience and time)
4. It could all just be random but you can guess after seeing all the info. If i missed any sorry i can edit it if need be.
Edit1. Updated 3/13/15
Additional Xur info: http://destinyxur.com
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If it is TRULY random, then you are falling into the Gamblers Fallacy, otherwise known as the Fallacy of Maturity of Probability, which is that one believes the odds of something occurring changes based on prior instances or lack of. If it is truly random, then the chances of an item being sold work off of a fixed probability, where every "roll of the dice" has an equal chance to produce any side. No favorability to or lessening based on prior occurrence.