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#logic

2 posts2 participants0 posts today

"One of us only lies, and the other only tells the truth. You may ask one question to determine which is which," the left guard finished the spiel.

"Well, you HAVE to be the one who tells the truth," I waved them off and headed for the left door.

"What? Why?" the left guard stopped me.

"Because if it was coming from the one who only lies, then the one who tells 'only' the truth would have to lie at least sometimes," I reasoned.

"The spiel is exempt from that," the one on the right said.

"Then I want to hear HIM say it," I pointed to the one on the left.

The left guard fell into a nervous silence. I stared at him expectantly.

"Damn it. Just go," he sighed.

"You can give my one question as a bonus to someone who needs it," I headed through the left door.