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In a famous series of letters, Blaise Pascal and Pierre de Fermat invented — or discovered — one of the most important concepts ...

TWEET IT - http://clicktotweet.com/bo6XQ You've made it to the final round of a game show, and get to pick between 3 doors, one ...

I have two children. One of them is a boy born on a Tuesday. What is the probability that both children are boys? This deceptively ...

View full lesson: http://ed.ted.com/lessons/can-you-solve-the-frog-riddle-derek-abbott You're stranded in a rainforest, and you've ...

In this video we'll be solving a tricky interview problem that has a beautiful solution. Join us if you're preparing for a quant ...

If two points are picked at random uniformly along the border of a square, what's the probability the distance between them is ...

Four friends claim they have been wrongly imprisoned. They are not criminals but mere harmless logicians! The warden says, "If ...

You throw a dice until you get 6. What is the expected number of throws (including the throw giving 6) conditioned on the event ...

Practice more problem-solving at https://brilliant.org/TedEd -- You've spent months creating a basketball-playing robot, the ...

You close your eyes and roll a pair of dice. The casino dealer announces that at least one of the rolls is showing a 1.What is the ...

In this video I go over tips and tricks to solving quantitative puzzles, along with several key skills needed to solve these puzzles.

Practice more problem-solving at https://brilliant.org/TedEd/ Sign up to be emailed the solution to the bonus riddle: ...

The 100 Prisoners Riddle feels completely impossible even once you know the answer. This video is sponsored by Brilliant.

Your support makes all the difference! By joining my Patreon, you'll help sustain and grow the content you love ...

This probability problem is frequently asked in interviews. It requires thinking outside of the box to choose the most optimized ...

Which of these dice games gives you the highest chance of winning? In this video, we explore a classic probability puzzle ...

Practice more problem-solving at https://brilliant.org/TedEd -- Ah, spring. As Demeter, Goddess of the Harvest, it's your favorite ...

A variation of the classic boy or girl paradox is making the rounds, leaving many confused by the counter-intuitive answer.