Mr. Lars and his wife Mrs. Lars went to a meetup and met 4 other married couples. Some people shook hands with each other, but no person shook hands with his or her spouse, and no person shook his or her own hand. Mr. Lars then asked each person, including his wife, “How many distinct people did you shake hands with?” Each person answered honestly, and surprisingly each person gave a different answer! How many distinct people did Mrs. Lars shake hands with? And how many distinct people did Mr. Lars shake hands with? It seems impossible, but you can actually solve this! Watch the video for a solution.
My blog post for this video
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Sources
The puzzle was published by Martin Gardner who credits Lars Bertil Owe.
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My Books
"The Joy of Game Theory" shows how you can use math to out-think your competition. (rated 3.9/5 stars on 29 reviews) [ Ссылка ]
"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 5/5 stars on 2 reviews) [ Ссылка ]
"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. [ Ссылка ]
"Math Puzzles Volume 2" is a sequel book with more great problems. (rated 5/5 stars on 3 reviews) [ Ссылка ]
"Math Puzzles Volume 3" is the third in the series. (rated 3.8/5 stars on 4 reviews) [ Ссылка ]
"40 Paradoxes in Logic, Probability, and Game Theory" contains thought-provoking and counter-intuitive results. (rated 4.3/5 stars on 12 reviews) [ Ссылка ]
"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) [ Ссылка ]
"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) [ Ссылка ]
