The Personal Best Challenge Book

The Personal Best Challenge Book

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What's YOUR personal best? Work your way through these weird and wonderful challenges and record your top scores along the way.

The Ultimate Challenge

The Ultimate Challenge

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The $3x+1$ problem, or Collatz problem, concerns the following seemingly innocent arithmetic procedure applied to integers: If an integer $x$ is odd then “mul

Everest Canada

Everest Canada

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FR-RARE-BK (copy 3): Gift of Diana M. Schatz from the Norah and Roland Michener collection.