How many books were in the Harry Potter series?

Which of there's 4 people is a character in the franchise? (Jack Black, Batman, Bob Ross, or Draco Malfoy)

Which school did J.K Rowling go to? (University of Exeter, Yale University, Harvard, or Manchester University)

What year was Harry Potter's Chamber of Secrets released? (1998, 1945, 2016, 1975)

What are the names of Harry Potter's 2 best friends?

What is the fourth book of the Harry Potter franchise? (The Prisoner of Azkaban, The Goblet of Fire, The Order of Phoenix, or The Half-Blood Prince)

Did J.K Rowling have a Pseudonym? (Yes or No)

Which of the following is not a book of J.K Rowling? (The Christmas Pig, The Ickabog, The Half-Blood Prince, and Pumpkins)

In, Hogwarts what house is Harry Potter in? (Slytherin, Gryffindor, Ravenclaw or Hufflepuff)

Which of the following is not a character in the Harry Potter Universe. (Draco Malfoy, Oliver Wood, Harry Potter, and Robert Galbraith)

What year was J.K Rowling born in? (1975, 1960, 1965 or 1972)

Around how many copies of Harry Potter were sold to the public? (500 million, 1 billion, 25 million or 900 million)