Newest Questions
30,136 questions
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If we roll a fair dice 36 times then what is the probability that we roll each number (1, 2, 3, 4, 5 and 6) exactly 6 times? [closed]
If we roll a fair dice 36 times then what is the probability that we roll each number (1, 2, 3, 4, 5 and 6) exactly 6 times?
It is an Oxford University interview problem.
- 8,703
4
votes
1
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344
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Cluing *non*-distinctive names
I was recently providing feedback on some cryptic clues, which led to me explicitly stating a guideline which I realized I don't have anything specific to back up. That is, I'm uncomfortable with over-...
- 16.4k
9
votes
2
answers
351
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Lights-out variant on an octahedron
You have an octahedron that’s covered in a 2 × 2 triangular grid, i.e., each face is divided into four congruent equilateral triangles (cells). Each cell of the grid hosts a light and a switch that ...
- 28.6k
15
votes
1
answer
901
views
Separated but Together
Two astronauts are stranded on separate asteroids, more than a million kilometers apart. Each asteroid is a different shape: jagged, irregular, nothing alike.
Desperate for connection, they wonder: is ...
- 1,246
0
votes
0
answers
193
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Rules of Mensa IQ Norway
I'm talking about the challenge test here: http://test.mensa.no
When I took this test I assumed that the pattern which gave the solution was always horizontal. That is, in each of the 3 rows, image 1-...
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15
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1
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667
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A Pair of Stanzas
Finding myself immersed in belles lettres I found this poem lacking, but it's got potential. I just feel like, God, it could be good or at least better with a small adjustment to each line.
The ...
- 1,246
6
votes
1
answer
393
views
Component parts
An explanatory note: I've composed this puzzle for the benefit of a fandom, and will provide that community with a link to it. To make the puzzle slightly more of a challenge for everyone else, I'm ...
- 14.3k
9
votes
1
answer
469
views
Cryptic Family Reunion: A Parade of Clues
This is a Cryptic Family Reunion puzzle, where a set of cryptic clues has been given, and the answer to each clue follows the same theme. Since a definition for the answer would give the answer away, ...
- 1,246
42
votes
1
answer
2k
views
"That’s fine, because… qatayef"
Wanda and Bob lounged in the campus square, playing one of Wanda’s favorite games. Here’s their first round:
Wanda: “We’re both book-learners, right? So maybe I should try… page.”
Bob: “Isn’t that ...
- 16.4k
5
votes
1
answer
458
views
The Plot Armor of the Galactic Engineer
The puzzle reads:
Suppose you are a galactic engineer. You are building a communication network between many distinct star systems. To prevent signal interference, every single pair of stars must be ...
- 487
21
votes
2
answers
1k
views
Silhouette of a slime mold attempting to mimic a centipede
The following image depicts the little-known* Western Centipede-Mimicking Slime Mold, here seen attempting (with limited success) to take on the form and coloration of a common garden centipede:
But ...
- 7,411
12
votes
1
answer
529
views
Cryptic crossword: re-greening old Paris
This is a cryptic crossword with letters latent. Each clue has an extra letter that must be removed before solving. Taking the removed letters in clue order will provide solvers with a way to ...
- 1,503
13
votes
1
answer
381
views
Lights-out variant on a beveled cube
You have a beveled cube where each face is a 3 × 3 grid of square cells, each edge a 1 × 3 grid, and each corner is a triangular cell. The cells (both square and triangular) have lights on them, of ...
- 28.6k
3
votes
3
answers
263
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What is wrong with the proof? [duplicate]
What is wrong with this proof?
Let $x\in\mathbb R$. Then
\begin{align*}
&&x^2+x+1 &= 0&&\\
\implies&&&&\text{(multiply both sides by $(x-1)$)}\\
&&(...
- 3,188
4
votes
1
answer
285
views
Find the missing colors in the 3x3 squares
Here is a puzzle I came up with.
Below you see a 3x3 grid of 3x3 squares. Can you find the correct colors for the 18 squares labelled with a "?" ?
Hint #1
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