Seven items are bought in the order: 1st Purse, 2nd Bracelet, 3rd Knife, 4th Paper, 5th Books, 6th Shirts, 7th Clock. Which of the following statements is/are correct? I) Paper is bought just after Books. II) Only two items are bought between Knife and Shirts. III) Knife is bought before Shirts.

In an examination, P, Q, R, and S each scored different marks. Q scored more than R and S. No one scored less than P. Who among them scored the maximum marks?

In a row of people facing north, P is 2nd from the right end and Q is 7th from the right end. Q is exactly between P and R. If R is 5th from the left end of the row, how many people are there in the row?