Question

If the mall is visited either on the day immediately preceding or on the day immediately following the visit to the shelter, which of the following must be true?

• A. The factory is visited on the day immediately preceding the visit to the police station.\
• B. The factory is visited on the day immediately preceding the visit to the shelter.\
• C. The factory is visited on the day immediately preceding the visit to the university.\
• D. The hospital is visited on the day immediately preceding the visit to the shelter.\
• E. The university is visited on the day immediately preceding the visit to the police station.

Hint:

Test block placements against base rules to find necessities.

Answer 1

The Correct Option is B

Step 1: Mall (M) and shelter (S) are consecutive: M-S or S-M block.
Step 2: Base rules: F before U; P after S; H not on 1 or 6.
Step 3: Valid block positions force F immediately before S in all cases.
Step 4: Only (B) must be true.