398 views

11:34 L

Watch
- Search Videos
  
  Advanced search »
- Submit a New Video
Discuss
About
- Try clicking on the various channels to see videos posted to that channel - if you're into music you can click the Music channel to get more music sifts - go on and explore! Use the "hotness" when you have opened the channel link to get videos that have gotten a lot of votes, or use "newness" to have a look at the new sifts.
  When browsing sifts you like, have a look at the Related Posts list to see other related videos, click the tags under the video title to see more sifts tagged with the same tags or have a look at other sifts from the same user in the More Posts By list. If the sifted video is in a play list, have a look at the play list to see other interesting videos the Sift users have linked together.
  Enter the Sift Lounge to chat with online sifters about anything and everything, or read interesting posts in the Sift Talk forum.
  The Top New Videos list is always full of interesting, current videos. It is always recommended that you have a look through the Top New Videos, but also have a look at these:
  - Upcoming Unsifted Videos - active video submissions that neither are published to the front page nor archived to the submitter's personal queue
- Have you seen a really funny, surprising, scary, interesting, cute or in any other way extra good quality video?
  Post and share it here - VideoSift is the best video aggregator on the Web, where we share, discuss, promote, and interact with the best videos out there on the web. Post it here, and share it with the large community of video-interested users. And - you are guaranteed to find more very good videos here already!
  Mind you, we only share videos you discover that someone else has made; if you "self link," by posting a video you have made, have posted or have interests in, you risk the ban hammer - read the posting guidelines before posting. The sift is NOT for promoting your own videos - it is for sharing videos others have made.
  Submit a Video Now »
Login

That Viral Math Problem (Cheryl's Birthday) - Numberphile

submitted by RFlagg

9 years 5 months 3 weeks ago

British

I couldn't figure out how the answer was known until they laid it out on a logic puzzle grid then worked it out from there. Now I get it.

7 Comments

So what's up with Cheryl? That's what i want to know.

Boosting this quality contribution up in the Hot Listing - declared quality by eric3579.

This is actually a simpler version of a much harder problem

http://en.m.wikipedia.org/wiki/Impossible_Puzzle

The logical deductions are similar but the maths leaps are way more difficult

Sniper007 says...

I didn't realize the months and dates were hard coded into the presentation of the problem. I thought they could be any random dates or any number of random dates.

That needs to be made exlicit - thy chose those dates specifically.

He took about 11 minutes more than necessary to explain this.

And I still don't quiet grasp it.

He took about 11 minutes more than necessary to explain this.

It's a Sudoku.

And I still don't quiet grasp it.

Discuss...

🗨️ Emojis & HTML

Enable JavaScript to submit a comment.

This website uses cookies.

This website uses cookies to improve user experience. By using this website you consent to all cookies in accordance with our Privacy Policy.