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Random Puzzles


Difficulty: MediumPuzzle 1

What letter completes this square in the most logical manner?

?

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[Ref: ZCSC] © Kevin Stone 



Difficulty: MediumPuzzle 2

What is the 1000th prime number?

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[Ref: ZETS] © Kevin Stone 



Difficulty: MediumPuzzle 3

What does this equation simplify to?

(x - a) * (x - b) * (x - c) * ... * (x - z) = ?

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[Ref: ZTDR]  



Difficulty: MediumPuzzle 4

I have a machine which has four sequential cog wheels in constant mesh.

The largest cog has 242 teeth and the others have 160, 64 and 22 respectively.

How many revolutions must the largest cog make before each of the cogs is back in its starting position?

?

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[Ref: ZLYD] © Kevin Stone 


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