First one is 9/10 second is 1 2/5
Because it shows how Alabamians lived in 19th to the mid 20th century, and buildings that were safe from destruction.
There are 6 other positions in the string, each with 26 choices. So if you fix BO as the first two letters, there are

possible strings that you can make.
If BO is at the end of the string, you still have

possible strings.
Together, then, you have

possible strings.