Question 9 Consider all 6 letter words made from the letters a through j. (In this context words are just strings of letters, not necessarily actual English words.)

Part a How many of these words are there total?

Part b How many of these words contain no repeated letters?

Part c How many of these words start with the sub-word kid?

Part d How many of these words either start with aha or end with bah or both?

Part e How many of the words containing no repeats also do not contain the sub-word hid?