Direction for the questions: (1- 5:)   Answer the questions on the basis of the following information.
The investigative body has arrested the mastermind called ‘JEJO’ and nine other people namely Abhay, Bhanu, Chandu,Dheeraj,Ekansh, Faisal, Girdhar, Harmeet and Ishant in a recent matter wherein the answers of a test held nationwide were leaked to a group of unscrupulous people.Interrogating them, the following facts have been obtained regarding their operation. Initially ‘JEJO’ obtains the correct answer-key. All the others create their answer-key from one or two people who already possess the same. These people are called his/her “sources”. If the person has two sources, then he/she compares the answer-keys obtained for both sources. If the key to a question from both sources is identical, it is copied, otherwise it is left blank. If the person has only one source, he/she copies the source’s answers into his/her copy. Finally, each person compulsorily replaces one of the answers (not a blank one) with a wrong answer in his/her answer key.
The paper contained 200 questions; so the investigative agency has ruled out the possibility of two or more of them introducing wrong answers to the same question. The investigative agency has a copy of the correct answer key and has tabulated the following data which represents question numbers.

Question 1:  Which one among the following must have two sources ?
(a) Abhay
(b) Bhanu
(c) Chandu
(d) Dheeraj

Question 2: How many people (excluding JIJO) needed to make answer keys before Chandu could make his answer key ?
(a) 2
(b) 3
(c) 4
(d) 5

Question 3: Both Girdhar and Harmeet were sources to :
(a) Faisal
(b) Bhanu
(c) Chandu
(d) None of above

Question 4: Which of the following statements is true ?
(a) Chandu introduced the wrong answer to question 27.
(b) Ekansh introduced the wrong answer to question 46.
(c) Faisal introduced the wrong answer to question 14.
(d) Harmeet introduced the wrong answer to question 46.

Answers and Explanations

Answer 1 : (b)

As the blank answer nos that appear in Bhanu’s column appears also in other columns, hence this is the answer

Answer 2 : (c)

Before Chandu could mark the answers, Dheeraj, Ekansh(source from where Chandu gets its blank answers) and Ishant (source where Chandugets Q. 27 wrong) must have prepared their answer keys. For Ekansh to prepare its answer key, it must have the data from Abhay. Thus 4 people must have made their answer keys before Chandu could make it.

Answer 3 : (d)

Girdhar got Q. 25 wrong and none of the other 9 people got the same wrong, and similarly for Harmeet. Thus Girdhar and Harmeet were sourcesto none of the nine.

Answer 4 : (c)

Chandu got Q. 56 wrong (27 wrong obtained from Ishant), Ekansh got Q. 90 wrong (46 obtained from A), Harmeetgot Q. 92 wrong (46 obtainedfrom Abhay). Thus the only answer has to be ‘c’.

Answer 5 : (d)

Ekansh and Harmeet both got Q. 46 wrong (90 and 92 were the compulsory wrong that they had to make). Thus they both should have had the same sources. Abhay, Dheerajand Girdhar had just one wrong question each and had no blank answers. Therefore these should also have had the same source.

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