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Two Sentries

Logic puzzles require you to think. You will have to be logical in your reasoning.

 

Puzzle ID:#9872
Fun:*** (2.3)
Difficulty:* (0.86)
Category:Logic
Submitted By:lesternoronha1****
Corrected By:dumbell

 

 

 



Two sentries were on duty outside a barracks. One faced up the road to watch for anyone approaching from the North. The other looked down the road to see if anyone was approached from the South. Suddenly one of them said to the other, "Why are you smiling?"

How did he know that his companion was smiling?




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