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> Logic> Probability> Shapes> General (1)
> Numbers (2)> Games> Paradoxes> Riddles
> Just Math> Science> Algorithms
If a set N9 = {1, 2, 3, 4, 5, 6, 7, 8, 9} of 9 numbers is split into two subsets, then at least one of them contains three terms in arithmetic progression.
The statement is not true for a set N8 of 8 integers.

Seems obvious?

Prove it.

(No Solution Yet, 1 Comments) Submitted on 2017-03-24 by Ady TZIDON   
Difficulty: 2 of 5 Bonus: Cops and Robbers (in Riddles) Rating: 1.88
There is a shoot-out going on behind a school somewhere in the US. The shoot-out is between a group of cops and a band of robbers. One of the robbers was shot in the heart, and one of the police officers was shot in the head. Neither died, but instead went to the sidelines to watch, talk, and laugh.

The police managed to get the robbers under control, but the robbers were not sent to jail. This is not a game between children. Can you answer these questions?

1. Why didn't those shot die?
2. What kind of school is this?
3. Why aren't the robbers in jail?
4. What on earth is going on here?

(Solution Posted, 19 Comments) Submitted on 2002-08-17 by Hope   
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Difficulty: 2 of 5Three heights in a triangle (in Geometry)
Posted on 2017-03-11 by Ady TZIDON (No Solution Yet, 2 Comments)
Difficulty: 3 of 5Staircases in a Cube (in Shapes)
Posted on 2017-03-10 by Brian Smith (No Solution Yet, 1 Comments)

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