Rule: 'If it rains, the school yard is closed.' The yard is open today. Which conclusion is certain?
Answer and explanation
Correct answer: B. It did not rain today
- Step 1: The rule says rain leads to a closed yard. Step 2. An open yard means the result 'closed' did not happen, so the cause 'rain' cannot have happened. Answer: It did not rain today. Why not the others: The rule is not broken, and it says nothing about sunny days or about closing the yard without rain.
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