Help me understand this. Math/logic puzzle follows... [more inside]
Calculusfilter. A man is led to the center of a valuable field which he does not own. He coats his feet in blue paint so that his path can be traced. At dawn he begins walking. At a randomly selected time he will be told to stop walking, whereupon he will walk in a perfectly straight line back to the starting point. Then he will be given all the land that has been circumscribed by his blue path. [more inside]
I'm looking for an awesome, tactile, mathy gift for a friend of mine. Suggestions? [more inside]
Mathematical sequences challenge. Need your help. [more inside]
Help with a Martin Gardner maths riddle, please! [more inside]
How many combinations are possible in this grid? [more inside]
I recently ran across a wonderful logic puzzle, but no solution was provided. I eventually worked out a complete solution myself, but it was rather ugly, and I would like to see if people smarter than me can come up with something more elegant. Are there any good Internet puzzle discussion forums floating around? [more inside]
My geometry teacher in high school in 1984 showed us this puzzle.
I was only half paying attention, but I believe the goal was to draw a line that intersected each segment only once. [more inside]
How do I solve this puzzle
mathematically, rather than programmatically? [more inside]
What are some (easy to moderate difficulty) math problems with integer answers ranging from 0-18? I'm making mathematical seating cards where guests will solve a problem to find their table number. [more inside]
Math puzzle filter. How do you go about solving this puzzle?
I am reading Douglas Coupland's new book (JPod) and I'm always a little frustrated by him. He seems to get the general vibe of nerds but is horribly off on details sometimes (in the first 50 pages, he makes reference to a "56k floppy disk"), which is agonizing. Anyway, he posits a math problem (I don't think this counts as a spoiler, I'll even omit the context and just pose the problem with page number, but if you really don't want to see anything about the book, don't read on, I guess.) [more inside]
You are suspended in a large, hollow sphere. The inside of the sphere is perfectly mirrored. There is nothing else in the sphere, and all you carry is a flashlight. You turn the flashlight on. What do you see? [more inside]
A crystal consists of 100,000,000 layers of atoms such that there is 1 atom in the first layer, 3 in the second, 6 in the third, 10 in the fourth, 15 in the fifth, and so forth. Exactly how many atoms are there in the entire crystal? [more inside]
The top of this little sign
says, "This compressed message [from the NAIC-Arecibo Observatory] is a mathematical puzzle for an intelligent species to solve. The answer will reveal information about the Earth and its people." I got nothin'. Help?
The management of my office building is holding a contest: determine the number of jelly beans in a container. Prize: $500 at Best Buy and all the beans. [more inside]
Can anyone settle a 15 year old argument for me? It turned into one of those things "we don't talk about" but it's always bugged me. The question is simple and involves three points and a circle - more inside. [more inside]