How do similar procs interact?

How do similar procs interact? - Unrecognizable young couple playing video game at home

Tried looking around for an answer to this question but most guides only talk about specific items. On a lot of the loot that I get there are generic procs (X% chance to XYZ on hit).

If I have multiple items that have the same generic proc are these all separate rolls or one single roll for that effect? For example, lets say I have 3 items with x% chance to blind on hit. A has 1%, B Has 1.5 % and C Has 2.5%. Does this translate into a single roll with 5% chance to blind, or just 3 separate rolls?






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Agile Value: Individuals and Interactions Over Processes and Tools




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