In this youtube link, a really cool method to multiply two big numbers is given. Only works of integers. I was wondering if something unconventional and s...

(S) If yesterday were tomorrow, then today would be Friday. Question: What day is today? This seems to be an old puzzle, and depending on the interpretati...

I've written a small Python script to give me the least number of moves it takes a knight to get from one square to any other on a $n{*}n$ chess boar...

If I flip a perfect coin, the chance of heads is obviously 0.5 with each toss. Equally obviously, if I toss 3 times in a row, the probability of getting 3...

I got $x + CBD = 110^{o}$. I think I should find measurements of angle CBD, so how to find it? Do you have any ideas? Please help me!

I'm currently an undergraduate student in mathematics. I am currently taking Algebra. The course is interesting, but I have grown very curious about ...

I'm asked the following two questions: How many Strings of 6 letters contain a) Exactly one Vowel b) At least one Vowel a) This is what I know: The E...

What is the shortcut way of finding the determinant of a 4 by 4 matrix (and I assume this applies to any n by n square matrix greater than 2) once you hav...

There is a scene in the movie "A Beautiful Mind" in which John Nash is talking to his friend Charles in Princeton Library. Nash shows Charles three pieces...

In the circle $x^2$ + $y^2$ = $a^2$, what's the general equation for the arcs in each of the quadrants?