![]() ![]() (It's not, but the reason is a bit tricky. In fact, the Singapore and Asian School Math Olympiads have released a statement in response to a popular argument that the answer is actually August 17. This doesn't have everyone convinced, though. ![]() Happy fucking birthday, Cheryl, you slippery enigmatrix. And that means there's only one possible birthday left: July 16. ![]() Bernard knows one more thing: that Albert got the correct answer by knowing the month.Īlbert couldn't do that if Cheryl's birthday were in August, because there are still two August dates for him to choose from. Bernard seemingly doesn't have enough information to answer the question. This is where some people, like Jianwen, probably gave up and declared the problem a trick. Now we've exhausted all of Bernard's information about the day, and we still don't have an answer. That leaves only three choices: July 16, Aug. Today, 4PX is the market leader in China by revenues, orders processed. Over 20,000 merchants rely on various 4PX services to succeed in the e-commerce world. 4PX services include logistics, software, and consulting services. It's the only repeated number, and it wouldn't give him any information about the correct month. 4PX Express ('4PX') was established in 2004 and is Chinas 1 cross-border e-commerce solutions provider. Knowing those months have been ruled out, Bernard's knowledge of the day suddenly gives him the answer. So we have to rule out May and June, both of which have days (the 18th and 19th) unique to them. The answer the authors of the test were actually looking for goes something like this:Īlbert knows that Bernard can't know the answer just by knowing the day. One possible solution is that Albert and Bernard are no longer friends with Cheryl, because nobody wants to chill with some wily human sphinx who introduces herself by presenting inscrutable logic problems.Ĭheryl: "What is that which in the morning goeth upon four feet upon two feet in the afternoon and in the Evening upon three?"īernard: "Come on, Albert. “Can you figure it out now?” she asked Albert.Īlbert: I don’t know when your birthday is, but I know Bernard doesn’t know, either.īernard: I didn’t know originally, but now I do. To Bernard, she whispered the day, and only the day. Then Cheryl whispered in Albert’s ear the month - and only the month - of her birthday. “When’s your birthday?” Albert asked Cheryl.Ĭheryl thought a second and said, “I’m not going to tell you, but I’ll give you some clues.” She wrote down a list of 10 dates: It might help to look at the NYT's restatement of the problem, which uses clearer language without changing the solution or the reasoning behind it:Īlbert and Bernard just met Cheryl. So, what's the answer? IS there an answer? When is Cheryl's goddamn birthday?! Since it hit Tumblr yesterday, the image below has started an internet schism that may never be… , the asinine social media argument-starter by which all asinine social media argument-starters are now measured. It's gone viral enough that even the New York Times compared it to The Dress Now the problem has driven the entire country mad, and it's spreading to the rest of the world. A question on a quiz for teenage mathletes proved so tricky for Singapore newscaster Kenneth Kong that he posted it to Facebook to find a definitive answer. ![]()
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