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Any know how stacking sigil math works

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Nepocrates.3642
#1 - Oct. 30, 2012, 7:44 a.m.
Blizzard Post

“Sigils that have a chance to trigger on critical hits stack their chance percentages multiplicatively, not additively. For example, two major Sigils of Fire, which each have a 20% chance to trigger on critical hit, will have a 36% chance to trigger, not 40%.”

I know I rusty on my math but I do not understand how two 20% sigils get to 36%. How do you get to that number?

Thanks

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CC Eva
#4 - Oct. 30, 2012, 9:20 a.m.
Blizzard Post

Perfect, as the question seems to be answered, we proceed to close the thread.