Practice mode Logical Reasoning

The mountain road is blocked if and only if it snows in the valley. It is known that it does not snow in the valley. Which of the following must be true?

Correct answer A. The mountain road is not blocked.

Explanation

'If and only if' works in both directions, so the two facts are always true together or false together. Since it does not snow in the valley, it follows that the mountain road is not blocked.

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Answer checked 11 October 2026 How we write and check questions

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The mountain road is blocked if and only if it snows in the valley. It is known that it does not snow in the valley. Which of the following must be true?

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The mountain road is blocked if and only if it snows in the valley. It is known that it does not snow in the valley. Which of the following must be true?

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