Solution
✅ Correct Option: 3
Slide 1/2
Understanding the Set:
- This is a question-based set. In this set, you are told that there are 16 patients and 8 vials — labeled A, B, C, D, E, F, G, and H.
(Vials are simply the containers in which blood samples are stored.)
- It is also given that only one person has the disease.
- If a patient has the disease, then every vial containing his/her blood sample will test positive.
a) If a vial tests positive, at least one of the patients whose blood samples were mixed in that vial has the disease.
b) If a vial tests negative, then none of the patients whose samples were mixed in that vial has the disease.
This set might initially seem a bit confusing, but it was actually one of the simplest sets asked.
The key was to understand the passage correctly — once that was done, the questions were softballs.
| Patient | Vials | Patient | Vials |
|---|---|---|---|
| 1 | B, D, F, H | 9 | A, D, F, H |
| 2 | B, D, F, G | 10 | A, D, F, G |
| 3 | B, D, E, H | 11 | A, D, E, H |
| 4 | B, D, E, G | 12 | A, D, E, G |
| 5 | B, C, F, H | 13 | A, C, F, H |
| 6 | B, C, F, G | 14 | A, C, F, G |
| 7 | B, C, E, H | 15 | A, C, E, H |
| 8 | B, C, E, G | 16 | A, C, E, G |
Going by options,
- 1st option is possible and it will result into patient 4 being diseased.
- 2nd option is possible and it will result into patient 4, 8 or 12 being diseased
- 3rd option is not possible is not possible as it will result into making all the patients free from disease.
- 4th option is possible as it will result into patient 14 being diseased.
So, 3rd option is the correct answer.
More from this set:
Question 1