This test question went viral on Twitter and then got coverage in the Baltimore Sun and other mainstream media. But most of the coverage was wrong. This video explains the game theory answer.
Blog post with a summary and more detailed discussion:
Tweet of exam question:
Professor Dylan Selterman (who posed this question)
Washington Post article (published 7 days after this video):
If you like my videos, you can support me at Patreon:
Connect on social media. I update each site when I have a new video or blog post, so you can follow me on whichever method is most convenient for you.
Newsletter (sent only for big news, like a new book release):
If you buy from the links below I may receive a commission for sales. This has no effect on the price for you.
“The Joy of Game Theory” shows how you can use math to out-think your competition. (rated 3.9/5 stars on 32 reviews)
“The Irrationality Illusion: How To Make Smart Decisions And Overcome Bias” is a handbook that explains the many ways we are biased about decision-making and offers techniques to make smart decisions. (rated 4.6/5 stars on 3 reviews)
“Math Puzzles Volume 1” features classic brain teasers and riddles with complete solutions for problems in counting, geometry, probability, and game theory. Volume 1 is rated 4.4/5 stars on 13 reviews.
“Math Puzzles Volume 2” is a sequel book with more great problems. (rated 4.3/5 stars on 4 reviews)
“Math Puzzles Volume 3” is the third in the series. (rated 3.8/5 stars on 5 reviews)
“40 Paradoxes in Logic, Probability, and Game Theory” contains thought-provoking and counter-intuitive results. (rated 4.3/5 stars on 12 reviews)
“The Best Mental Math Tricks” teaches how you can look like a math genius by solving problems in your head (rated 4.7/5 stars on 4 reviews)
“Multiply Numbers By Drawing Lines” This book is a reference guide for my video that has over 1 million views on a geometric method to multiply numbers. (rated 5/5 stars on 3 reviews)