6. 8 books are on a shelf. What is the probability that a) 'Ten little bears in a bed' is first? b) 'Ten little bears in a bed' is first and 'Five little ducks' is last? C) 'Ten little bears in a bed' and 'Five little ducks' are together? d) "Ten little bears in a bed' and 'Five little ducks' are together at the front of the shelf? e) the books are in alphabetical order