20% mods ponder

Lets say I have, for example, a wand and an off handed item. They both contain a half skill recharge mod of 20%. How is the in game math coded to deal with this scenario?
Would it come out as (2)(1/5) = 2/5 = 40%, or would it be like two seperate instances of rolling for 1/5.
In the case of the second scenario the odds would be the same as just having 1 mod because the 2 instances of 1/5 would be 2/10 which is still 20%. Hmmmmmm. If you don't see what i mean then think of rolling two 5 sided die where the favored result would be to get whatever number you choose on either die. Lets just say you had to roll a 1 on either die to get the desired result. This is 2 chances out of 10 = 20%
Any insight out there is needed. Thx

I think it stacks to 40%

Yes i suspect that it might, but besides going out and casting the same spell over and over and counting the hrt's you get there is no credibility in just saying it does without some insight into the games code.

Two separate checks for the 20%.

Edit: Misinformation removed.

I believe they are added together, though that's simply from observation.

However, your math is wrong. If the two are not added to 40%, you will have a 36% chance with the 20% mod applied twice. This is simple statistics:

Possibility 1: First mod works (20% chance)
---> Second mod works (20% chance)
-Net chance: 4%
---> Second mod fails (80% chance)
-Net chance: 16%
Possibility 2: First mod fails (80% chance)
---> Second mod works (20% chance)
-Net chance: 16%
---> Second mod fails (80% chance)
-Net chance: 64%

In any case but the last, at least one of the two mods works and you succeed in recharging the spell twice as fast.

Not this again. Answer is here: http://www.guildwarsguru.com/forum/s...php?t=10040956
It's in the FAQ Sticky thread at the top of this forum. Note there is a cap on cast/recharge reduction of 50%, so the 4% chance of both mods will not result in 25%. If both mods trigger, it will only result in a 50% reduction, the second effect will no longer trigger.

edit: Fury's got it. Basically:

64% chance: Nothing happens.
32% chance: One mod triggers; 50% reduced cast/recharge, whichever mod it is.
4% chance: Both mods trigger, but the cap results in only 50%, not 25%.

Hah, it's been too long since I played mage types seriously. I missed the update that capped the speeds.

Yea thx for the link i was confused till i studied Savio's graph; I think I almost understand how that works lol.