The rec.puzzles archive

Classic recreational puzzles from the rec.puzzles newsgroup. Each puzzle includes a solution, compiled from various sources, which is supposed to be definitive.

  • Analysis: Distance and time puzzles, but also others about continuous functions.
  • Arithmetic: Puzzles that focus on the use of arithmetic operators such as addition, subtraction and multiplication.
  • Combinatorics: Combinations and permutations, and related kinds of enumeration (listing of objects that satisfy a particular property).
  • Competition: Questions about games.
  • Decision Theory: Here's the situation. Is it better to do this or that?
  • Geometry: Figures in the plane or in three-dimensional space.
  • Group: What's the difference between the ones on the left and the ones on the right?
  • Mathematical Induction: Couples shaking hands at a party.
  • Language: Questions about various languages across the globe.
  • Logic: Use equations or clever reasoning to solve complex word problems.
  • Physics: Physics brainteasers.
  • Cliff Pickover: Puzzles by Cliff Pickover (what a great name!).
  • Probability: What are the odds that...?
  • Real-Life: From everyday life.
  • Series: Sequences--what comes next after...?
  • Trivia: Do you know? (Probably not!)
  • References Where to look for more information.
Credit:

The archive is the original work of many newsgroup posters, not of the editor!

In keeping with the general net practice on FAQ's, we do not as a rule assign credit for solutions. However, we do whenever possible put bibliographies in archive entries.

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