Jan gets home late, it's dark and she cannot see her keys. Her key ring has 5 similar keys, so she is going to pick a key to try to open the door. Two of the keys will open the door and the other keys will not. What is the probability she will get the door open on the first or second try?
so does this mean she has a 2/5 chance of 1st or 2nd try, or does this not include every possibility
i also thought it could be 4/25, but probability is brand new to me and i am not sure which way would be correct???????????