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Q. 1: Which of the following MUST be true?
1. The contamination level at P10 was recorded as high.
2. The contamination level at P13 was recorded as low.
3. The contamination level at P20 was recorded as medium.
4. The contamination level at P12 was recorded as high.
Correct Answer: 1
Explanation: According to 1 and 2, we get
Also, from 4, we get 2 cases:
From (5)
If total number of low (L) pipes = 3
number of high (H) pipes = 6 number of medium (M) pipes = 11 Also if number of low (L) pipes = 4 number of high (H) pipes = 8 number of medium (M) pipes = 8 P7 and P8 can be HH or MM
Therefore, two cases arise for P1 – P10
Correct Answer: 1
Q. 3: If the contamination level at P11 was recorded as low, then which of the following MUST be true?
1. The contamination level at P12 was recorded as high.
2. The contamination level at P14 was recorded as medium.
3. The contamination level at P15 was recorded as medium.
4. The contamination level at P18 was recorded as low.
Correct Answer: 2
Q. 4: If contamination level at P15 was recorded as medium, then which of the following MUST be FALSE?
1. Contamination level at P14 was recorded to be higher than that at P15.
2. Contamination levels at P10 and P14 were recorded as the same.
3. Contamination levels at P13 and P17 were recorded as the same.
4. Contamination levels at P11 and P16 were recorded as the same
Correct Answer: 4
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