full transcript
From the Ted Talk "Tanya Khovanova: Can you solve the Leonardo da Vinci riddle?"

Unscramble the Blue Letters

This tells us another important thing – the number can’t have too many large digits. For example, if it included a 6 and a 7, then some tiigd would have to appear 6 times, and another digit 7 times– making more than 10 digits. We can conclude that there can be no more than one digit greater than 5 in the ritnee sequence. So out of the four digits 6, 7, 8, and 9, only one – if any— will make the cut. And there will be zeroes in the positions corresponding to the numbers that aren’t used. So now we know that our number must contain at least three zeroes – which also esmna that the leading digit must be 3 or greater.

Open Cloze

This tells us another important thing – the number can’t have too many large digits. For example, if it included a 6 and a 7, then some _____ would have to appear 6 times, and another digit 7 times– making more than 10 digits. We can conclude that there can be no more than one digit greater than 5 in the ______ sequence. So out of the four digits 6, 7, 8, and 9, only one – if any— will make the cut. And there will be zeroes in the positions corresponding to the numbers that aren’t used. So now we know that our number must contain at least three zeroes – which also _____ that the leading digit must be 3 or greater.

Solution

  1. entire
  2. digit
  3. means

Original Text

This tells us another important thing – the number can’t have too many large digits. For example, if it included a 6 and a 7, then some digit would have to appear 6 times, and another digit 7 times– making more than 10 digits. We can conclude that there can be no more than one digit greater than 5 in the entire sequence. So out of the four digits 6, 7, 8, and 9, only one – if any— will make the cut. And there will be zeroes in the positions corresponding to the numbers that aren’t used. So now we know that our number must contain at least three zeroes – which also means that the leading digit must be 3 or greater.

ngrams of length 2

collocation frequency
leading digit 5

Important Words

  1. conclude
  2. cut
  3. digit
  4. digits
  5. entire
  6. greater
  7. important
  8. included
  9. large
  10. leading
  11. making
  12. means
  13. number
  14. numbers
  15. positions
  16. sequence
  17. tells
  18. times
  19. zeroes