Newest Questions
29,692 questions
14
votes
5
answers
2k
views
prisoners riddle - a button, a light and a timer
Here is (yet another) prisoner riddle. I made it up (maybe it was asked before, but to the best of my knowledge I'm the first to ask it - correct me if I'm wrong).
There are 1000 prisoners who are ...
- 143
-5
votes
1
answer
175
views
It could be magic
You could enjoy a ride as well...
This is my idea implemented with ChatGPT assistance
- 1,049
3
votes
2
answers
770
views
How many gloves do we need to randomly select to ensure each octopus will have 8 different colored gloves? [closed]
The restaurant is a major sponsor of the Aquatic Boxers’ Club. From time to time, two octopuses from the ABC are invited to the restaurant to put on a boxing match in an aquarium, for the ...
- 32.1k
19
votes
3
answers
1k
views
Two semicircles in a parallelogram
Two congruent semicircles (blue) are inscribed in the two triangles formed by the short diagonal (black) of a parallelogram (also black) as shown below. The short diagonal has the same length as the ...
- 20.4k
10
votes
2
answers
969
views
Short and sweet puzzle
Figure out the picture and savor the fruit of your labor...
This is my own idea
- 1,049
1
vote
1
answer
217
views
My Most Recent Chess Tournament
This is a lightweight puzzle, hopefully entertaining but not difficult. Since my FIDE rating for classical Chess is 2343 at the time of writing, I recommend you do not post a solution to this puzzle ...
- 7,920
4
votes
4
answers
754
views
Multiplying pounds and shillings swaps the numbers
If you double £6 13s, you get £13 6s, which is merely changing the shillings and the pounds.
Can you find all the other sums of money that has the same peculiarity that, when multiplied by any integer ...
- 7,575
1
vote
2
answers
224
views
If it takes n weighings to identify the fake coin among k coins, then n+1 weighings will be required to identify the fake coin among 3k+3 coins
I was trying to solve the following puzzle:
"We are given 12 coins. 11 of them are genuine and 1 is fake. All of the genuine coins weigh the same. The fake coin is either lighter or heavier than ...
- 7,575
2
votes
4
answers
322
views
Explain deduction from LinkedIn's Queen #564
LinkedIn's Queen #564 (HARD difficulty)
I am watching the commentary of today's Queen puzzle (a 1* Star Battle puzzle), given that I complete it in about 2 minutes. But one thing I don't quite ...
- 109
3
votes
2
answers
216
views
Interesting dates for a person
A person is very excited for these dates, and these are the only dates he is very excited for.
April 22, 2204
November 23, 2311
November 24, 2411
May 25, 2505
January 17, 1701 counts if we don't base ...
- 1,935
1
vote
0
answers
108
views
How do I solve Jumble word puzzles using the scrambled letters and final answer pattern?
I'm trying to understand how to solve Jumble puzzles (the daily word scramble puzzle).
Each puzzle gives:
Four scrambled words
Some circled letters from each word
A final answer with a pattern of ...
2
votes
2
answers
198
views
7
votes
2
answers
642
views
-3
votes
1
answer
255
views
Lewis Carroll with Probabilities
Here's a famous Lewis Carroll problem:
Babies are illogical
Nobody is despised who can manage a crocodile
Illogical persons are despised
The conclusion is: Babies cannot manage crocodiles.
I've ...
- 846
2
votes
0
answers
99
views
Is there a Python solver for the Picture-Cube?
I'm working on a CayleyPy project where we study the diameters of graphs that come from different combinatorial puzzles. At the moment I’m focusing on the Picture-Cube, a 3×3×3 puzzle where each move ...
- 29