The probability based approach would be 1 - (1 - 0.2) * (1 - 0.3) = 44% dodge rate. However, I suspect that only the highest dodge instance applies, which would be 30% here. Potions are a special case, since you paid for them they stack, using the probability based approach.
Well, I’d like to know the exact answer. @Kafka, @Cyrup, could you please shed some light onto this problem?
I have an answer for you!
Each chance is calculated separately. They do not stack. 
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Okay, then total percent of dodging is 44?
If the two chances are indeed independently calculated, then yes. However, that 44% is not a number stored in the code anywhere. It’s just the theoretical outcome of individual 20% and 30% chances.
(If you want to test this out and take some data, I am all ears. Much too lazy to do it myself.)
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Sure, this figure is just result of probabilistic formula.