Comprehension
Four tasks (A, B, C, D) are scheduled on four days (1, 2, 3, 4), one task per day.
- A is before B.
- C is not on day 1.
- D is on day 3 or 4.
- B is not on day 4.
Question: 1
Which task is on day 3?
Which task is on day 3?
Show Hint
In scheduling, start with fixed or restrictive conditions (e.g., D on 3 or 4) and test arrangements.
Updated On: Aug 11, 2025
- A
- B
- C
- D
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The Correct Option is D
Solution and Explanation
- Step 1: Apply conditions. A before B. C not on 1. D on 3 or 4. B not on 4.
- Step 2: Analyze D's position. D on 3 or 4. Test D on 3: Day 3 = D.
- Step 3: Place A, B. A before B, B not on 4. Possible: A on 1, B on 2 or 4 (but not 4), so A on 1, B on 2.
- Step 4: Place C. C not on 1, so C on 4. Arrangement: A, B, D, C.
- Step 5: Test D on 4. D on 4. B not on 4, so B on 1, 2, or 3. A before B, so A on 1, B on 2 (or A on 2, B on 3). C not on 1. Try A on 1, B on 2, D on 4, C on 3: Valid. Try A on 2, B on 3, D on 4, C on 1 (invalid, C not on 1).
- Step 6: Check day 3. First case: D on 3. Second case: C on 3. Question asks day 3: D is possible.
- Step 7: Verify. D on 3 satisfies all conditions in A, B, D, C.
- Step 8: Check options. Options: (1) A, (2) B, (3) C, (4) D. D matches option (4).
- Step 9: Conclusion. Option (4) is correct.
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Question: 2
Which task is on day 4?
Which task is on day 4?
Show Hint
For follow-up scheduling questions, use the established arrangement and verify consistency.
Updated On: Aug 11, 2025
- A
- B
- C
- D
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The Correct Option is C
Solution and Explanation
- Step 1: Use arrangement from Q21. Arrangement: A, B, D, C (days 1, 2, 3, 4).
- Step 2: Check day 4. Day 4 = C.
- Step 3: Verify. A before B (1, 2), C not on 1 (on 4), D on 3 or 4 (on 3), B not on 4. All satisfied.
- Step 4: Test alternative. D on 4: A on 1, B on 2, C on 3, D on 4. Also valid. Day 4 = D.
- Step 5: Re-evaluate. Question assumes one arrangement. From Q21, D on 3 implies C on 4.
- Step 6: Check options. Options: (1) A, (2) B, (3) C, (4) D. C matches option (3) for D on 3.
- Step 7: Conclusion. Option (3) is correct.
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Question: 3
Which task is on day 1?
Which task is on day 1?
Show Hint
For position questions, rely on the derived arrangement and check directly.
Updated On: Aug 11, 2025
- A
- B
- C
- D
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The Correct Option is A
Solution and Explanation
- Step 1: Use arrangement. From Q21: A, B, D, C.
- Step 2: Check day 1. Day 1 = A.
- Step 3: Verify. A before B, C not on 1, D on 3, B not on 4. All satisfied.
- Step 4: Check options. Options: (1) A, (2) B, (3) C, (4) D. A matches option (1).
- Step 5: Conclusion. Option (1) is correct.
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Question: 4
Which task cannot be on day 2?
Which task cannot be on day 2?
Show Hint
For "cannot be" questions, focus on restrictive conditions that limit specific positions.
Updated On: Aug 11, 2025
- A
- B
- C
- D
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The Correct Option is D
Solution and Explanation
- Step 1: Check conditions.
D on 3 or 4, so D cannot be on 2.
- Step 2: Verify others.
Arrangement: A, B, D, C. Day 2 = B.
Alternative: A, B, C, D (D on 4).
Day 2 = B or C possible.
A possible if B on 3. D never on 2.
- Step 3: Check options.
Options: (1) A, (2) B, (3) C, (4) D.
D matches option (4).
- Step 4: Conclusion. Option (4) is correct.
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