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Welcome to perplexus.info, flooble's perplexing puzzle portal. Here, we collect all sorts of puzzles, from simple logic questions and word tricks to in-depth math problems like probability and geometry. Click around and see if your brain is up to the task! If you're new here, make sure you sign up so that you can leave comments and submit your own problems!
> Logic (1)> Probability> Shapes> General (2)
> Numbers> Games> Paradoxes> Riddles
> Just Math> Science> Algorithms
You meet a trio of people, A, B, and C. You know that one of them is a knight, one is a liar, and one is a normal, but you are not sure which is which. Normals tell the truth and lie at random. You are allowed to ask three yes-or-no questions. What three questions can you ask to find out which is which?
(No Solution Yet, 1 Comments) Submitted on 2017-08-21 by Math Man   
Difficulty: 4 of 5 Bonus: A game of 15 (in Games) Rating: 4.13
Two players play this game. Numbers from 1 to 9 are layed out in a row. Players take turns putting a coin on one of the numbers that does not yet have a coin on it. Player one puts his coins head-up, and player two -- tails-up.

The winner of this game is the first person to have their coins on three numbers that add up to 15. (For example if a player has coins on 1, 6 and 9, they can win the game by putting a coin on either 8 or 5.)

Is there a strategy for playing this game? Is there a sure-fire way of winning?

(Solution Posted, 4 Comments) Submitted on 2002-05-10 by levik   
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