# 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.

Frequently Asked Questions from rec.puzzles