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 in the following manner. They obtain the 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.
Table 1: Test Results Table
| Name | Wrong Answer(s) | Blank Answer(s) |
|---|---|---|
| A | 46 | - |
| B | 96 | 46, 90, 25 |
| C | 27, 56 | 17, 46, 90 |
| D | 17 | - |
| E | 46, 90 | - |
| F | 14, 46 | 92, 90 |
| G | 25 | - |
| H | 46, 92 | 25 |
| I | 27 | 17, 46, 90 |
Which one among the following must have two sources?
Show Hint
- A
- B
- C
- D
The Correct Option is B
Solution and Explanation
How many people (excluding the mastermind) needed to make answer-keys before C could make his answer-key?
Show Hint
- 2
- 3
- 4
- 5
The Correct Option is C
Solution and Explanation
Both G and H were sources to:
Show Hint
- F
- B
- I
- None of the nine
The Correct Option is A
Solution and Explanation
Which of the following statements is true?
Show Hint
- C introduced the wrong answer to question 27.
- E introduced the wrong answer to question 46.
- F introduced the wrong answer to question 14.
- H introduced the wrong answer to question 46.
The Correct Option is B
Solution and Explanation
Which two groups of people had identical sources?
I. A, D and G
II. E and H
I. A, D and G
II. E and H
Show Hint
- Only I
- Only II
- Neither I nor II
- Both I and II
The Correct Option is D
Solution and Explanation
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