This problem was shared on Facebook with the claim that only one in a thousand could figure it out. It went viral and generated over 3 million comments. Here is the problem. If 1 + 4 = 5, 2 + 5 = 12, 3 + 6 = 21, what is 8 + 11 = ? This video presents what many people believe to be the correct answer.\r<br>\r<br>Blog post (text explanation and an extra proof): \r<br>\r<br>Facebook post that went viral\r<br>\r<br>\r<br>Telegraph coverage\r<br>\r<br>\r<br>Reddit Puzzles\r<br>\r<br>\r<br>If you like my videos, you can support me at Patreon: \r<br>\r<br>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.\r<br>\r<br>My Blog: \r<br>Twitter: \r<br>Facebook: \r<br>Google+: \r<br>Pinterest: \r<br>Tumblr: \r<br>Instagram: \r<br>Patreon: \r<br>\r<br>Newsletter (sent about 2 times a year): \r<br>\r<br>My Books\r<br>\r<br>The Joy of Game Theory shows how you can use math to out-think your competition. (rated 4/5 stars on 23 reviews) \r<br>\r<br>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 1 review) \r<br>\r<br>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 4.5/5 stars on 11 reviews. \r<br>\r<br>Math Puzzles Volume 2 is a sequel book with more great problems. \r<br>\r<br>Math Puzzles Volume 3 is the third in the . \r<br>\r<br>40 Paradoxes in Logic, Probability, and Game Theory contains thought-provoking and counter-intuitive results. (rated 4.9/5 stars on 7 reviews) \r<br>\r<br>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 3 reviews) \r<br>\r<br>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 1 review)
