Question: Alice would like to open Bob's lock but does not know the key. Question 1 : How many different keys would Alice have to try

Alice would like to open Bob's lock but does not know the key.
Question 1: How many different keys would Alice have to try to be certain to open the lock?
Answer 1: She would have to try 256 keys.
Question 2: How many different keys would Alice have to try to have a 50-50 chance to open the lock?
Answer 2: She would have to try 128 keys.

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