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 \r Blog post (text explanation and an extra proof): \r \r Facebook post that went viral\r \r \r Telegraph coverage\r \r \r Reddit Puzzles\r \r \r If you like my videos, you can support me at Patreon:\r \r \r 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 \r My Blog: \r Twitter: \r Facebook: \r Google+: \r Pinterest: \r Tumblr: \r Instagram: \r Patreon: \r \r Newsletter (sent about 2 times a year): \r \r If you buy from the links below I may receive a commission for sales. This has no effect on the price for you.\r \r My Books\r The Joy of Game Theory shows how you can use math to out-think your competition. (rated 3.8/5 stars on 31 reviews)\r \r \r 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)\r \r \r 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. \r \r \r Math Puzzles Volume 2 is a sequel book with more great problems. (rated 5/5 stars on 3 reviews)\r \r \r Math Puzzles Volume 3 is the third in the . (rated 3.8/5 stars on 4 reviews)\r \r \r 40 Paradoxes in Logic, Probability, and Game Theory contains thought-provoking and counter-intuitive results. (rated 4.3/5 stars on 12 reviews)\r \r \r 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) \r \r \r 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)\r
