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The Number of the Day: 20%

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It's possible that up to 20% of people won't be able to watch 3D programming on their TV due to a lazy eye muscle, color-blindness, headaches, or motion sickness.


Related Fact: Analysts expect about 1.6 million 3D-ready TV sets will be shipped in North America by the end of 2010.


[Sources: Wall Street Journal/The Hollywood Reporter. See previous Numbers of the Day here. ]

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This Puzzling Math Brain Teaser Has a Simple Solution
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Fans of number-based brainteasers might find themselves pleasantly stumped by the following question, posed by TED-Ed’s Alex Gendler: Which sequence of integers comes next?

1, 11, 21, 1211, 111221, ?

Mathematicians may recognize this pattern as a specific type of number sequence—called a “look-and-say sequence"—that yields a distinct pattern. As for those who aren't number enthusiasts, they should try reading the numbers they see aloud (so that 1 becomes "one one," 11 is "two ones," 21 is "one two, one one,” and so on) to figure the answer.

Still can’t crack the code? Learn the surprisingly simple secret to solving the sequence by watching the video below.

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What Number Is The Answer?
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