The least possible Venn diagram for the given statements is as below,
Conclusions: 1. All pages are books → True (It is clear from the given statement that all the pages are diaries and all the diaries are books so all pages are books will also be correct). 2. Some books are diaries → True (It is clear that all diaries are books, so some books are also diaries will be right). 3. All books are pages → False (It is clear that all pages are diaries and all the diaries are books but we can't say that all the books are pages it can be or cannot be because no direct relation is given from the book side). Thus, Only conclusion I and II follow.