CAT2003 Re-Test: LRDI - Leaked Exam

Recently, the answers of a test held nationwide were leaked to a group of unscrupulous people. The investigative agency has arrested the mastermind and nine other people A, B, C, D, E, F, G, H and I in this matter. Interrogating them, the following facts have been obtained regarding their operation. Initially the mastermind 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 from 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. These data represent question numbers.

110. Which one among the following must have two sources?
(1) A
(2) B
(3) C
(4) D

111. How many people (excluding the mastermind) needed to make answer keys before C could make his
answer key?
(1) 2
(2) 3
(3) 4
(4) 5

112. Both G and H were sources to
(1) F
(2) B
(3) I
(4) None of the nine.

113. Which of the following statements is true?
(1) C introduced the wrong answer to question 27.
(2) E introduced the wrong answer to question 46.
(3) F introduced the wrong answer to question 14.
(4) H introduced the wrong answer to question 46.