From FAQ:
Does this gem/ability stack with that other one?
Unless otherwise stated in the effect description, EVERYTHING should stack except for aura effects of the same type. If a gem doesn't have aura in the name then it is not an aura. All damage over time gems stack because they are not auras. This includes Damage Over Time (DoT) gems which you can cast repeatedly to build up damage.
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Computing the probability that at least one of the following events will occur:
P(a or b ... or z) = 1 - P(!a and !b ... and !z)
Probability
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