Comprehension
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 |
Question: 1
Which one among the following must have two sources?
Which one among the following must have two sources?
Show Hint
When analyzing answers, pay attention to the number of wrong and blank answers as indicators of multiple sources.
Updated On: Aug 1, 2025
- A
- B
- C
- D
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The Correct Option is B
Solution and Explanation
From the table, B has both wrong answers (96) and blank answers (46, 90, 25). This suggests B must have had two sources, one being identical and the other with a discrepancy. Therefore, the Correct Answer is B.
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Question: 2
How many people (excluding the mastermind) needed to make answer-keys before C could make his answer-key?
How many people (excluding the mastermind) needed to make answer-keys before C could make his answer-key?
Show Hint
Consider the number of unique wrong answers when determining how many sources were involved in generating an answer key.
Updated On: Aug 1, 2025
- 2
- 3
- 4
- 5
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The Correct Option is C
Solution and Explanation
From the table, C has three different wrong answers and one blank answer. C must have copied from at least 4 different people to create his own answer-key.
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Question: 3
Both G and H were sources to:
Both G and H were sources to:
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Look for matching answers across individuals to identify common sources, especially when multiple wrong answers are involved.
Updated On: Aug 1, 2025
- F
- B
- I
- None of the nine
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The Correct Option is A
Solution and Explanation
Both G and H's answers to question 46 are identical to F’s. This suggests that G and H must have been the sources for F.
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Question: 4
Which of the following statements is true?
Which of the following statements is true?
Show Hint
Pay careful attention to which person contributed wrong answers for specific questions to identify the errors more easily.
Updated On: Aug 1, 2025
- 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.
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The Correct Option is B
Solution and Explanation
From the data provided, E's wrong answer to question 46 corresponds to the incorrect data provided in the table. Thus, the correct statement is (2).
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Question: 5
Which two groups of people had identical sources?
I. A, D and G
II. E and H
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
Cross-reference individuals who have identical answers to identify matching sources used in the answer key preparation.
Updated On: Aug 1, 2025
- Only I
- Only II
- Neither I nor II
- Both I and II
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The Correct Option is D
Solution and Explanation
From the data, A, D, and G had identical sources for answers. Also, E and H used the same source for their answers. Hence, the Correct Answer is (4).
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