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There are 36 checkers on a \(6\times6\) board (one checker per one cell). They are numbered from 1 to 36. You need to rearrange the checkers so that the ones with numbers which differ by 1 are neighbours (their cells share an edge) and additionally all square numbers have to correspond to the checkers of one (a) horizontal line; (b) of the diagonals. Is it possible or not?

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Could you formulate a question which both a liar and a knight would answer identically (either “Yes” or “No”)?

Inhabitant A tells Inhabitant B, “At least one of us is a liar”. Who is A and who is B?

Three inhabitants are passing by. You ask the three inhabitants, “How many among you are knights?” The first one replies, “There is none”. The second inhabitant argues, “There is only one”. What should the third inhabitant say?

John is a knight, he never lies. But when you ask him the same question twice, his second answer suddenly is different from the first. How is it possible?

a) Twelve inhabitants are sitting under a big tree. One of them says, “There is at least one liar among us”. How many knights can be among them?

b) A different group of other twelve inhabitants is resting by the river. Suddenly, one of them exclaims, “If everyone except me is a liar, then I am a liar too”. How many liars can be among them?

Ten inhabitants are sitting around the table. Each one of them says, “My neighbour on the right is a knight”. How many knights and liars are sitting there?

lbert (A), his wife Beatrix (B), and their children Charlie (C), Dan (D) and Elizabeth (E) live in a bungalow. They have a really nice TV set. It is known that

1) If A is watching the TV, then B is watching the TV.

2) At least one of D and E is watching the TV.

3) Only one of B and C is watching the TV.

4) Either C and D are watching the TV together, or both are not watching.

5) If E is watching the TV, then both A and D are also watching the TV. Can you tell who is watching the TV in this family and who is not?

Once I found a really strange notebook. There were 100 statements in the notebook, namely

“There is exactly one false statement in this notebook.”

“There are exactly two false statements in this notebook.”

“There are exactly three false statements in this notebook.”

...

“There are exactly one hundred false statements in this notebooks.”

Are there any true statements in this notebook? If there are some true statements, then which ones are true?

There are some coins laying flat on the table, each with a head side and a tail side. Fifteen of them are heads up, the others are tails up. You can’t feel, see or in any other way find out which side is up, but you can turn them upside down. Split the coins into two piles such that there is the same number of heads in each pile.