# NIELIT 2019 Feb Scientist D - Section A: 18

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Read the following information carefully and answer the questions given below :

1. Five students Sujit, Randhir, Neena, Mihir and Vinay have total five books on subjects Physics, Chemistry, Maths, Biology and English written by authors Gupta, Khanna, Harish, D'Souza and Edwin.Each student has only book on one of the five subjects.
2. Gupta is the author of Physics book, which is not owned by Vinay or Sujit.
3. Mihir owns the book written by Edwin.
4. Neena owns Maths book. Vinay has English book, which is not written by Khanna. Biology book is written by D'Souza.

Who is the author of Chemistry book?

1. Harish only
2. Edwin only
3. Khanna or Harish
4. Edwin or Khanna

retagged

Ans is option (B)

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 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 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 chemitry book is written by Edwin only.

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