Eden Savage Loot System Math

[Pepsi_Plunge]

I personally have never seen two items of the same set type drop in any previous savage content so I am going to assume the maximum number of boxes of your type is 1. Assuming 3 pieces of loot drop:

Chance that loot 1 is not of your type: 1 - (1/7) = 85.71%

Assuming you didn't win that, there are now 6 item types in the pool:

Chance that loot 2 is not of your type: 0.8571 * (1-(1/6)) = 71.43%

Let me stop you right there, because that's where you are wrong. It's always 1/7 because an Item can drop multiple times. Or at least be of the same class. You can get a ring of fending, an earring of fending and a bracelet of fending all in the same run and leave as a happy tank (if you win against your co-tank, that is). Or there can be two earrings of fending, etc.