7 Find the number of ways the 9 letters of the word SEVENTEEN can be arranged in each of the following cases.
- One of the letter Es is in the centre with 4 letters on either side.
- No E is next to another E.
5 letters are chosen from the 9 letters of the word SEVENTEEN. - Find the number of possible selections which contain exactly 2 Es and exactly 2 Ns.
- Find the number of possible selections which contain at least 2 Es.
If you use the following lined page to complete the answer(s) to any question(s), the question number(s) must be clearly shown.