Top new questions this week:
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A mad lexophile sits alone in his apartment obsessively rearranging his Scrabble tiles and writing words on every available surface, even filling each floorboard with a word. The Scrabble tiles have ...
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I've recently returned from a week of travelling around Europe, visiting a different town or city in a different country on each day, choosing my destinations according to an underlying pattern. I've ...
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I was making ripple effect but failed on uniqueness. That leads me to think of using inequality signs to fix the puzzle. Then, I'm wondering, what if, I make a new one with intentional inequality ...
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On a recent trip to Europe, I visited a beautiful gothic abbey. Walking up the dark aisle between old wooden pews, the air heavy with the odour of incense, I could only marvel at the beautiful stained ...
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Your fifth is in cookies but never in cream.
Your fourth is in stormclouds and also in steam.
Your last's in your meaning but not in your word.
Your second's in fourth, first, three-hundredth, and ...
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For which n is it possible to split all the integers 1, 2, 3, ..., n into two non-empty disjoint sets such that the product of the sum of the elements in one set and that of those in the other is a ...
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A regular tetrahedron with one black and three white faces is positioned with its black face at the bottom of a plane. The tetrahedron is tipped several times over an edge and finally reaches the same ...
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Greatest hits from previous weeks:
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In the Missionaries and Cannibals problem:
Three missionaries and three cannibals must cross a river using a boat which can carry at most two people, under the constraint that, for both banks and ...
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You are in a prison. There are 3 doors, and a ghost standing in the middle of the prison. He says one of the doors is the way to freedom while the other two lead to death. You get to ask only one ...
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You can keep it only after you give it to someone else. What is it?
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In a 3x3 grid, I'd have to put numbers from 1 to 9 in a manner so that respective row, column and diagonal add up to 15.
I have only been able to come up with one solution:
6
1
8
7
5
3
2
9
4
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I saw the following problem on 4chan and couldn't solve it:
It's very likely to be some kind of troll (no solution).
I'm hoping to see some rigorous proofs that disprove the existence of such a line....
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My Father is a Chemist
My Mother is a Mathematician
They call me iron59
What is my real name?
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Note: My grandma is a little odd. She only likes certain things. Solve this puzzle by providing phrases that are true. For example: Grandma likes A but not B
Grandma likes coffee but not tea.
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Can you answer this question?
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Dazed, you slowly regain consciousness. You don’t know how you got here, but one thing is certain – your exploration of this otherworldly planet has reached an ugly end. Trapped in an alien crypt, ...
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