Twelve books are placed on a shelf from left to right. Four of them are small paperbacks, two are large paperbacks, three are cloth bound books, and three are leather bound books. Known The first is a large paperback, the fourth is a leather-bound book, the three cloth-bound books are not next to each other, the three leather-bound books are put together, and the four small paperbacks are also put together. On the far right. Ask which of the following must be a large paperback? ['Book 3.', 'Book 6.', 'Book 7.', 'Eighth.']