The Four Shelves: Okafor, Petrova, Tanaka, and Moreau

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zebra

Four shelves stand in a row, numbered 1 to 4 from left to right. Each holds exactly one of each attribute, and no attribute repeats. Work out the full arrangement from these clues: 1. The author with the red cover is immediately to the right of Okafor. 2. Tanaka is directly next to Okafor. 3. The author with the black cover is Moreau. 4. The author with the red cover is the author with the hardback. 5. The author with the blue cover is the author with the leather-bound edition. 6. The author with the white cover is Tanaka. 7. The author with the hardback is directly next to the author with the paperback.

Hints

Hint 1

Hint 2

Hint 3

Solution

Commit an attempt to unseal the proof. Write your answer — right or wrong, thinking it through is the point.

In the final arrangement, which numbered shelf (1–4) does “Okafor” end up at? Answer with the number.

Hints

Solution

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