# Tagged Questions

This tag is meant for questions about the mathematical principles behind games, riddles, or their possible solutions. If the answer is known to you please do not use this tag to "riddle" other users, but rather to ask about the correctness of a possible solution or ways to extend and improve an ...

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### Find the Wrong Student

There are 15 student in the class and each of them has a different number 1 to 15. Student #1: wrote the natural number on the board. Student #2 said : This number is divisible by my number(number ...
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### Length of left stick [on hold]

Break the stick into 3 pieces and what would be the expected length of left stick? I need answer for this to verify my answer. Can somebody give me the answer? My thoughts: My answer is 1/4. First ...
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### A 3-valued mathematical logic?

Classical propositional logic is consistent and in conformity with human language. A formal statement is true or not true and it is possible to develope rules with which it is possible decide which ...
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### Shortest possible distance to locate an unknown road

You are stranded in the middle of a large desert and the only way home is a through a straight road, which unfortunately you do not know the location of. If the perpendicular distance from you to ...
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### A simple discrete math riddle [on hold]

Let P be a set of integers. Let N be the number of the elements in P. Prove that there must be a subset of P that it's sum is divided by N. Any idea?
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### Distances over a rectangular parallelepiped

It is given a rectangular parallelepiped $3\times4\times5$. Which are the farthest points from a given vertex, provided one can only walk on the surface of the parallelepiped? [Edit, for ...
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### Maximizing the chances of picking up a red marble. [closed]

You have 2 jars, 50 red marbles and 50 blue marbles. You have to place all the marbles into the jars such that when you blindly pick one marble out of one jar, you maximize the chances that it'll be ...
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### Cake slicing problem for irrational angles

I came across the following question "A person plays the following game with a cake. He cuts a piece forming a circular sector of x degrees and flips the piece upside down, with the icing on the ...
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### Next term in the given series

What will be next term of given series: $$​50, 30, 40, 75, 170, ?$$ I am not able to find the pattern in the series. Could someone help me with this?
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### Venn diagram puzzle problem

All batangos are crentons , some franters are volns, and some kijuxes are not batangos. If no kijuxes are franters, which of the following CANNOT be true, given each group was observed to only 2 ...
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### Three players were presented with 3 red balls and 2 yellow balls, 3 balls were chosen at random

and each was concealed in a different box. The challenge was for each player in turn to look inside two of the boxes to see if they could determine the color of the ball in the other box. The first ...
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### How many lines are needed on the plane to get all angles from $1$ to $359$ degrees?

I am trying to solve following problem: How many lines are needed on the plane to get all angles from $1$ to $359$ degrees? We can move lines in parallel. I am thinking that since moving in parallel ...
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### Math's puzzle school problem

I got this weird homework situation and i can't find out what the answer is. I got to find out how to get $828$ using the numbers $8, 6, 8, 3, 75$ and $9$. Moreover, I can use all the operators \$*, -,...