Ans is option (A)
From the given data, I will fill information in two tables(namely Subject-Student-Author and Author-Subject).
→ Correct entries are marked in bold letters in each cell.
After analyzing the information, we get the tables as:
Subject-Student-Author Table
Subject |
Chemistry/Biology |
Physics/Chemistry/
Biology
|
Maths |
Physics/Chemistry/
Biology
|
English |
Student |
Sujit |
Randhir |
Neena |
Mihir |
Vinay |
Author |
Khanna/Harish/
Edwin/D’Souza
|
Gupta/Khanna/
Harish/Edwin/
D’Souza
|
Khanna/Harish/
Edwin
|
Edwin |
Harish/Edwin |
Author-Subject Table
Author |
Gupta |
Khanna |
Harish |
D’Souza |
Edwin |
Subject |
Physics |
Chemistry/Maths |
English/Chemistry/Maths |
Biology |
English/Chemistry/Maths |
It is given that the Physics book is not owned by neither Sujit nor Vinay. Also, since Neena has Maths book and Vinay has English book, we get two possibilities for Physics book owner i.e. Mihir and Randhir. Now, since Mihir owns a book written by Edwin(who is not the author of Physics book), we can safely say that Randhir owns the Physics book, and hence Randhir’s book details will be Physics-Randhir-Gupta..
Now, since Khanna is not the author of the English book, English as a subject can be placed as a possibility only in Harish and Edwin’s column in Author-Subject table. Now, in the Subject-student-author table, in the Vinay’s book details, we can only place Harish as Edwin is already present in Mihir’s book details. So, Vinay has English book written by Harish.
Now, in Neena’s book details, we have Khanna/Harish/Edwin, from which Harish and Edwin can be safely removed. So, Khanna is the author of Maths book.
Also, Edwin’s subject possiblities were English, Chemistry and Maths, from which English and Maths can be safely removed(their respective authors being Harish and Khanna). So, Edwin is the author of Chemistry book. Also, under Sujit’s book details, Khanna,Harish and Edwin can be safely removed now, which confirms the fact that D’Souza is the author of Biology book.
Now, summarizing all the results, we get the two final tables as:
Subject |
Biology |
Physics
|
Maths |
Chemistry
|
English |
Student |
Sujit |
Randhir |
Neena |
Mihir |
Vinay |
Author |
D’Souza
|
Gupta
|
Khanna
|
Edwin |
Harish |
Author |
Gupta |
Khanna |
Harish |
D’Souza |
Edwin |
Subject |
Physics |
Maths |
English |
Biology |
Chemistry |
So,the book written by Harish is English , which is owned by Vinay.