Civil Service Exam Reviewer · Logical Reasoning · hard
Consider the statement: "The shipment is held at customs unless the documents are complete." Suppose it is true that the shipment is not held at customs. Which conclusion necessarily follows?
- The documents are complete.
- The documents are not complete.
- The shipment is held at customs.
- No definite conclusion can be drawn.
Answer
A. The documents are complete.
Solution
"The shipment is held at customs unless the documents are complete" means: if the documents are not complete, then the shipment is held at customs. Its contrapositive is: if the shipment is not held at customs, then the documents are complete. Since the shipment is not held at customs, it follows that the documents are complete.
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