Gizmodo Monday Puzzle: This Counterintuitive Card Puzzle Will Make You Flip

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If the next card is red, you win. Choose your move wisely.

There is a famous problem in math called The Secretary Problem. You are hiring for a job at your company, and you will interviewpeople, one at a time. Through the interviews, you are able to rank each candidate in order relative to the other candidates you’ve seen so far . The trouble is, after each interview, you must decide on the spot whether you want to hire that candidate or to reject them and continue the process, risking never meeting someone that qualified again.

Euler’s number, e, is about 2.7182 and is renowned for cropping up everywhere in seemingly disparate areas of math. You might have encountered e in calculus class, or if you’ve enjoyed compound interest on your investments, or ever looked at a bell curve, or suffered bacteria growth, or had shock absorbers on your bike/car, or let your

. As mathematical constants go, pi enjoys celebrity status, with its own holiday and contests for memorizing its digits. Meanwhile, e is the modest workhorse of the physical world, dutifully holding everything together in the background, too dignified for limelight.Here’s the solution to The Secretary Problem: Always reject the first 1/e fraction of candidates out of hand . After that, hire the first candidate you meet who is better than every other one you’ve met so far .

 

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