1. yes
2. It selects the highest of the 2.
3. Defence doesn't do anything against the mez effect itself, but, say, ranged defense does prevent you from being hit by a ranged mez attack the same way it protects you from a ranged damage attack.
Info on defence: paragon wiki
More technical info on how hitting things works: more Wiki
@True Metal
Co-leader of Callous Crew SG. Based on Union server.
The quick way of looking at it (and this is somewhat wrong, but the detail is tedious) is that your defense reduces the chance of a particular attack hitting you.
If someone has a normal 90% chance of hitting you and you have a defense of 30% against the incoming attack, it reduces their chance to hit to 60%.
Your actual defense against a specific attack is "the greatest of all possible defenses against that attack". So if you have ranged defense 20% and fire defense 30%, the game will use the 30% against a ranged fire power.
The wisdom of Shadowe: Ghostraptor: The Shadowe is wise ...; FFM: Shadowe is no longer wise.
; Techbot_Alpha: Also, what Shadowe said. It seems he is still somewhat wise 
; Bull Throttle: Shadowe was unwise in this instance...; Rock_Powerfist: in this instance Shadowe is wise.; Techbot_Alpha: Shadowe is very wise *nods*; Zortel: *Quotable line about Shadowe being wise goes here.*
Thank you both, that clears up my questions.
Having designed my build on Mids I think my aforementioned MM will have about 30% ranged, melee and AOE defence and a little bit of resistance. I could redo it so I had about 25% melee defence and about 38-40% ranged defence but thought I would keep them more equal.
Does 30% sound high enough? Could I go toe to toe against most enemies? Anyone have any ideas.
BTW my tankermind is a necro/dark - yes I know Bots/FF would be better but i like zombies 
Life is one big practical joke that we as the human race have yet to see the punchline to. Once you work that out the rest is easy.
30% is about the same defence a Super Reflexes Scrapper would get, so it's very good.
To get an idea of how good your defence is going to be, double your defence value and that's the percentage chance of (most) NPCs missing you, so 30% defence means NPCs only have a 40% chance of hitting you.
I am the Blaster, I have filled the role of Tank, Controller and Defender
Sometimes all at once.
Union EU player! Pip pip, tally ho, top hats and tea etc etc
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Does 30% sound high enough? Could I go toe to toe against most enemies? Anyone have any ideas.
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Always look at both sides.
A simple mob (minion, your lvl) has 50% hit chance. There is a 5% floor, the 'always hit' chance. If you want to reach 'maximum' defence against this mob, you need 45% defence. This 45% is the so called 'softcap', going beyond 45% defence wont mater as the mob only has 50% and your 45% + 5% floor = 50%
Also combine, if you lower their accuracy, less chance to hit. More defence you get, the bigger the gap, and specialy /dark is awsome in this part (along -acc from graveknights).
50)Sinergy X/(50)Mika.
(50)MaceX/(50)Encore
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30% is about the same defence a Super Reflexes Scrapper would get, so it's very good.
To get an idea of how good your defence is going to be, double your defence value and that's the percentage chance of (most) NPCs missing you, so 30% defence means NPCs only have a 40% chance of hitting you.
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... what?
Thats totally wrong.
if you have 30% defense, a normal npc will have a 20% chance to hit you.
Maybe confused with the 75% base hit players have? (30+40+5 = 75%).
50)Sinergy X/(50)Mika.
(50)MaceX/(50)Encore
Sign the petition, dont let CoH go down! SIGN!
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Maybe confused with the 75% base hit players have? (30+40+5 = 75%).
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Still makes no sense.
If he he assumed 75% accuracy, why would he be multiplyign by two? 
And 30% defense on 75% chance to hit => new chance to hit: 75-30 = 45%
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Still makes no sense.
If he he assumed 75% accuracy, why would he be multiplyign by two?
And 30% defense on 75% chance to hit => new chance to hit: 75-30 = 45%
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I think the "math" here was:
1) same level minion has 50% hit chance
2) 50% is half of 100%
3) so multiply your defense by 2 to find your 'real' defense! 30% * 2 = 60% meaning 40% chance to hit.
Too bad math doesnt work that way, eh?
I do not suffer from altitis, I enjoy every character of it.
Yea. neither math nor defense works like that 
Lets see if I can remeber this correctly.
Everything in the game has a base accuracy of 50%. This is modified by the multiplier for the entity/critter/whatever. A player has a 1.5 multiplier. Therefore a player accuracy is 50*1.5 or 75%. It used to be that the multiplier was applied after the multiplication. So 30% defence would reduce a 75% accuracy to a 45% hit rate. Obviously as accuracy went up the defence based character could get eaten alive. So it was altered to be (50 - defense) * multiplier. So a 30% accuracy would give (50-30) * 1.5 or 30% hit chance. This is also altered by the tohit buff/debuff modifier but I can't remember how.
So a 30% defence gives about a 30% chance to hit you.
De fence is da guy wot u take ya hot stuff to.
I really should do something about this signature.
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De fence is da guy wot u take ya hot stuff to.
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Nah it's wot u use to keep da neighbours out!
Thelonious Monk
When I moved house I made sure to buy a place next door to a guy who buys and sells stolen goods.
Becuase I heared that good fences make good neighbours!
ahthankyew
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When I moved house I made sure to buy a place next door to a guy who buys and sells stolen goods.
Becuase I heared that good fences make good neighbours!
ahthankyew
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Hits Imoba_Strife over the head with a hardback copy of Equal Rites.
This is sort of a three part question. I normally wouldnt bother looking at numbers and have generally stayed away from the whole IO thing but recently taken an interest.
Currently slotting my Mastermind for Defence with the overall hope of making a Tankermind build (dunno if its possible just thought I would give it a go) but there are a couple of things that are confusing me:
1. Start with the noobish question - am I right in thinking that defence is the probability of an attack hitting you whilst resistance affects the damage done. So a resisted attack will still hit but will do less damage whereas a defended attack decides whether or not the attack hits at all?
2. 2nd question - how does defence actually work? Say for example, I have a ranged defence of 30% and a fire defence of 30% does that mean that if a critter uses a fire bolt attack there is a 60% chance of it not hitting (combined range and fire defence)? Or does it mean that there is a roll to see if the ranged attack hits and if not then checks to see if the fire attack hits and if not I defend against it. Can someone explain please?
3. How does defence work against mez effects? taking the above example what if instead of fire bolt, someone used fire cages? and if i successfully defended against the fire element of the attack would I also automatically defend against the immobilise? I know you can protect against mez effects separately but is that necessary if your overall defence is high enough?
Please help. I'm confused!