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

## Unscramble the Blue Letters

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 snilge failure can’t tell you whether both batteries are dead, or just one. But if all three comnbnatiois 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 falis again, you’ll know this set can have no more than one good battery. That would lvaee only two biarttees 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.
## Open Cloze

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 **______** 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 combination **_____** again, you’ll know this set can have no more than one good battery. That would **_____** only two **_________** 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.
## Solution

- single
- combinations
- batteries
- leave
- fails

## 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.
## Frequently Occurring Word Combinations

### ngrams of length 2

collocation |
frequency |

good batteries |
3 |

giant batteries |
2 |

## Important Words

- accounted
- batteries
- battery
- combination
- combinations
- dead
- fail
- fails
- failure
- good
- group
- iron
- leave
- match
- power
- process
- remaining
- repeat
- set
- single
- total
- untried
- working