Misc: What three numbers divide into nine evenly?

Questions

Trivia : How many states (including internal territories) does Australia contain?

Trivia : Which Australian city hosted its final Formula 1 race in 1995?

Trivia : Anzac troops come from which 2 countries?

Trivia : What is the collective term for a group of nightingales?

Trivia : Who wrote "A Streetcar Named Desire" in 1947?