full transcript
"From the Ted Talk by Alex Gendler: Can you solve the giant iron riddle?"

Unscramble the Blue Letters

So instead of six batieerts, let’s take any three. This group has a total of three possible combinations. Since both batteries have to be working for the iron to power up, a single failure can’t tell you whether both batteries are dead, or just one. But if all three cntoainmibos fail, then you’ll know this group has either one good battery, or none at all. Now you can set those three aside and repeat the process for another three batteries. You might get a match, but if every cbmiatonion flias again, you’ll know this set can have no more than one good battery. That would leave only two batteries untried. Since there are four good batteries in total and you’ve only accounted for two so far, both of these rniimeang ones must be good.

Open Cloze

So instead of six _________, let’s take any three. This group has a total of three possible combinations. Since both batteries have to be working for the iron to power up, a single failure can’t tell you whether both batteries are dead, or just one. But if all three ____________ fail, then you’ll know this group has either one good battery, or none at all. Now you can set those three aside and repeat the process for another three batteries. You might get a match, but if every ___________ _____ again, you’ll know this set can have no more than one good battery. That would leave only two batteries untried. Since there are four good batteries in total and you’ve only accounted for two so far, both of these _________ ones must be good.

Solution

  1. combinations
  2. fails
  3. batteries
  4. remaining
  5. combination

Original Text

So instead of six batteries, let’s take any three. This group has a total of three possible combinations. Since both batteries have to be working for the iron to power up, a single failure can’t tell you whether both batteries are dead, or just one. But if all three combinations fail, then you’ll know this group has either one good battery, or none at all. Now you can set those three aside and repeat the process for another three batteries. You might get a match, but if every combination fails again, you’ll know this set can have no more than one good battery. That would leave only two batteries untried. Since there are four good batteries in total and you’ve only accounted for two so far, both of these remaining ones must be good.

ngrams of length 2

collocation frequency
good batteries 3

Important Words

  1. accounted
  2. batteries
  3. battery
  4. combination
  5. combinations
  6. dead
  7. fail
  8. fails
  9. failure
  10. good
  11. group
  12. iron
  13. leave
  14. match
  15. power
  16. process
  17. remaining
  18. repeat
  19. set
  20. single
  21. total
  22. untried
  23. working