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You do know wich door the host will open: one with a goat.The information you get from the host opening the door is not useless. Your initial choice and your choice between the 2 doors are two separate events and the second event is conditioned on the first.
You certainly don't have a 50% chance of winning on the first event since you don't know which door the host will open.
Here we go again - this problem has just been discussed in another thread. It amazes me that people can put out statements with this incredible certainty when they are wrong......