Question
Which of the following book is covered by Brown
paper? Study the following information carefully and answer the given questions: 7 books are stacked one above the other in such a way that the box at bottom is numbered 1 and top most box is numbered 7. These books are of different subjects - Commerce, English, Hindi, Computer, Maths, Reasoning and Science. Each book has a thickness – 11mm, 22mm, 33mm, 44mm, 55mm, 66mm and 77mm. These are covered by different colored papers – Black, Blue, Brown, Green, Pink, Red and White. There are 2 books between White and Blue colored books. Commerce book is placed at top of the stack having thickness 77mm and is covered by pink paper. There are 2 books between Science and book having 11mm thickness. Science book is placed above book having 11mm thickness. 1 book is placed between Hindi and book having 44mm thickness. Hindi book is placed somewhere above 44mm book. Reasoning book is placed somewhere below the book having 55mm thickness. There are 2 books between Reasoning and book having 55mm thickness. Book having 33mm thickness is placed immediately above book having 55mm thickness, which is covered by white paper. The book covered by a black paper is placed at the bottom of the stack. There are 2 books between English and Computer. Computer book having 22mm thickness is covered by Green paper. Science book is kept immediately above Computer book.Solution
Commerce book is placed at the top of the stack having thickness 77mm and is covered by Pink color. The book covered by a black paper is placed at the bottom of the stack. There are 2 books between Reasoning and book having 55mm thickness. And Reasoning book is placed below book having 55mm thickness. Book having 33mm thickness is placed immediately above book having 55mm thickness, which is covered by white colored paper. Therefore, Case – 1 and Case – 2 arise because position of books having 33mm and 55mm is not clear. Case-1 
There are 2 books between English and Computer books Computer book is covered by Green colored, having thickness 22mm.There are 2 books between Science book and book having 11mm thickness. Science book is place above the book having 11mm thickness. Therefore, Case – 1(a) and Case – 1(b) arise because position of English book is not clear. Case-1a 
CASE-1B 
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