defensive ability accuracy reduction question.

Championcritic

Hi, can someone please clarify how ability reduction is stacked? Like for example, if my opponent has an ability which triggers 100% of the time when struck, and my crossbones has 3 stacks of fury at 22% reduction per fury, is the opponent gonna be 100% - 3(22%) =34% or is it going to be 100%*((3*66)/100) = 66%? Im getting alot of conflicting advice from the internet.

mum_m2

it's 22% PER fury. which means 4 furies would mean an 88% reduction.