Solving Knights-And-Knaves Questions

Note: this paper is collected There is an island far off in the Pacific, called the Island of Knights and Knaves. On this island, there are people called knights, who always tell the truth, and people called knaves, who always lie.  The two types are indistinguishable by sight. You meet two people, A and B. …

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Người bạn cũ – Sài Gòn

Ngày nắng mới đợi tôi về, Ngoảnh đầu nhìn lại người bạn cũ. Tôi vẫn còn một chặng đường xa...  

Check your logic

There are n statements as follows: Statement No. 1. "There is exactly 1 false statement in this list." Statement No. 2. "There are exactly 2 false statements in this list." ... Statement No. n-1. "There are exactly n-1 false statements in this list." Statement No. n. "There are exactly n false statements in this list." …