CAT 2020 Question Paper | CAT LR DI Slot 3

CAT Questions

The CAT Exam always throws something new in the DILR section every year. One must be aware of the CAT exam pattern and have a strategy to tackle this very changing nature of DILR in CAT. The DILR Set that you see below is from slot 3 of CAT 2020 Question Paper.
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CAT DILR : CAT 2020 Question Paper Slot 3

Sixteen patients in a hospital must undergo a blood test for a disease. It is known that exactly one of them has the disease. The hospital has only eight testing kits and has decided to pool blood samples of patients into eight vials for the tests. The patients are numbered 1 through 16, and the vials are labelled A, B, C, D, E, F, G, and H. The following table shows the vials into which each patient’s blood sample is distributed.
 
If a patient has the disease, then each vial containing his/her blood sample will test positive. If a vial tests positive, one of the patients whose blood samples were mixed in the vial has the disease. If a vial tests negative, then none of the patients whose blood samples were mixed in the vial has the disease.

Question 23 : Which of the following combinations of test results is NOT possible?

1. Vial B positive, vials C, F and H negative
2. Vials A and G positive, vials D and E negative
3. Vials B and D positive, vials F and H negative
4. Vials A and E positive, vials C and D negative

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Video Explanation

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Explanatory Answer

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The question is " Which of the following combinations of test results is NOT possible? "

Hence, the answer is 'Vials A and E positive, vials C and D negative'

Choice D is the correct answer.

 

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