Hello, William!
a) How many permutations are there of the letters in the word BASEBALL?
My thinking: . . . . Right!
b) How many begin with the letter A?
Place one of the 's in front: .
Then the other seven letters
. . can be arranged in ways.
c) How many end with the letter E?
Place the on the end: .
Then the other seven letters
. . can be arranged in ways.