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**The Chips are Down**

There are three stacks of casino chips. The first has 21 chips, the second 99, and the third has 45. You can do two things with the stacks. Take a stack and put it on top of another stack. Take a stack and divide it evenly into two stacks. Is there a sequ...

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**Answer to The Usual Suspects**

This is the solution to the puzzle The Usual Suspects which I published today. If you haven't read it yet, don't self-spoil - go have a read of it and see how far you get. Then come back here. So, there are two ways to answer this puzzle. The first is wi...

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**The Usual Suspects**

Here's an interesting logic puzzle whose solution isn't at first obvious. Six suspects in a bank raid, all blaming each other. But is there a way to deduce from their lies and half truths who actually did it? The Usual Suspects have been brought in after ...

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**Answer to The Professor's Balls**

This is the answer to the puzzle The Professor's Balls . If you haven't read it yet, here's the link . Here’s how to work out whether you should take the professor’s bet. Let (R,G,Y) be current state of the balls' colours expressed as a vector, where R = t...

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**The Answer to Algebra Witchcraft**

The answer is: Well, the algebra is perfectly well formed. So if you were looking for a mistaken or slight of hand, there isn't one. That's what the clue was about - its not a trick. So if it isn't a trick, what gives. Given: a=b We can substitute b th...

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**Algebra Witchcraft**

Little whimsical Algebra Riddle for Christmas. Question: Is there a mistake in the algebra? If yes, where? If not, WTF? Before you click, I'll say one thing. It's not a trick. Here's the answer

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Three colours of ball, R, G, B. Any pair-wise collision changes two different colours to the same (third) colour. You start with 13 red, 15 green and 17 blue balls.

Does a sequence of collisions exist such that all of the balls end up being the same colour?

Does a sequence of collisions exist such that all of the balls end up being the same colour?

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**The Professor''s Balls**

There exists in the professor's mind a remarkable billiards game. It consists of any number of balls, but only three colours: red, green and blue. There's one player. Each round the player chooses a ball and takes a shot. If two balls collide and they're...

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