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A puzzle related to mathematical facts and objects, whose solution needs mathematical arguments. General mathematics questions are off-topic but can be asked on Mathematics Stack Exchange.

-1 votes

Twitter Followers

If each user is following exactly one other user, then it can be a ring of 300 users forming a circle. Pulling every third person from that loop will give you a group of 100 users who are not followi …
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1 vote
3 answers
675 views

A short and simple riddle

One day, while playing Minecraft, a player ran at full speed up to a tree and dug into the ground. There, they found a mysterious note. It said: I am a thing. If you do something to me, and then do …
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  • 2,697
5 votes

Optimal Rope Burning

This is a new and different answer than the one I posted previously and I felt it warranted its own spot. My apologies if this is bad form. Solution: Cut the rope into X+1 pieces, where X is the numb …
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  • 2,697
-4 votes

The Islanders and their Birthday Presents

Yes, he can kill the leader, take his place, and all of the leader's friends. For some bizarre reason, this is not unthinkably rude in the strange and unusual customs of this island. alternatively, t …
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-1 votes
1 answer
232 views

Seven Spheres of Unequal Mass, a weighing problem with a twist

You have a scale that is remarkably sturdy, and there are seven spheres of unequal mass. No sphere has the same mass as any other. There is (almost) no limit to the mass of any sphere, but the most …
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22 votes

Is it always possible to balance a 4-legged table?

The answer is: Reason by provable test case: ...Here's some images to help illustrate the problem. Here's a grid of bubbles covering the floor. we can surmise that a table could put its legs …
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1 vote

Rigged casino that prevents pairs

While brainstorming on this, I think I can establish an absolute maximum upper bound. There are $52$ cards in the deck, and for each one, it needs to be adjacent to one of only $49$ of the remaining …
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  • 2,697