3 ms·

> Among those people, there’s either a group of three who all know each other, or a group of three who have never met. Or a group of three who have never met.

> Among those people, there’s either a group of three who all know each other, or a group of three who have never met. Or a group of three who have never met. In your example, B, F and D have never met.

bena 5y ago
That's true. I got caught up in the first half of it. It would be significantly harder to make a ring of six.
- verst 5y ago
  Even in a ring of six 3 have never met. :)
  - bena 5y ago
    See, even now, knowing I'm not thinking about the negative result, I'm forgetting the negative result.