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I'm very glad that you took a shot at it and felt uncertain about the answer, because I feel the same way.
Unfortunately, I didn't find the answer in the book.
Here's my logic though.
I thought Troll 2 was the only possibility for a knight.
I thought he was telling the truth that Troll 1 (a knave) was lying.
Troll 3 has to be lying because if all 3 were knaves, they'd all be lying and since Troll 1 and Troll 2 are in conflict with each other, one of them has to be telling the truth.
But, I cannot exactly rectify part 2 of Troll 3's statement (at least one of us is a knight).
But, I am entirely unsure about everything.
Is your answer correct? I will look it over again and see if it all seems to reconcile.
Thanks again for putting yourself out there. Maybe someone will come along who is confident of the answer.
Reposting riddle for reference:
While walking through a fictional forest, you encounter three trolls guarding a bridge. Each is either a knight, who always tells the truth, or a knave, who always lies. The trolls will not let you pass until you correctly identify each as either a knight or a knave. Each troll makes a single statement:
Troll 1: If I am a knave, then there are exactly two knights here. Troll 2: Troll 1 is lying.
Troll 3: Either we are all knaves or at least one of us is a knight.
Which troll is which?
Solution 2 from me
as I read it again, I think that Troll 1 and Troll 3 are knights.
The new coffee machines at work are odd. Bean to cup! you get the usual buzz word coffees and the Decaf versions including Espresso decaf , why, I always thought Espresso was a quick short I need to be awake NOW, this second. A decaf version I think would concentrated coffee taste and thats it. I suppose it's offered as it used as base for the other drinks...but why?
I guess caffeine is addictive, and can lead to nasty side effects when abused of. Some like to get the placebo effect from it, though. Metabolisation time[^] being 45 minutes, the "NOW" effect does come from your brain, which reacts to the fact that it now knows that you have drank a coffee.
Oh. So we could serve him a tea made from my worn socks and it would work as long as he believes that this is coffee? Great. I think I will not wash socks anymore. Instead I'm going to shredder them and fill them into capsules, which I sell just under the current gold price.
I have lived with several Zen masters - all of them were cats.
His last invention was an evil Lasagna. It didn't kill anyone, and it actually tasted pretty good.
Have one of those machines in the apartment building I live.
About a year ago I started to drink espresso slowly with a cube of raw sugar on the side for afterwards while taking a break during the day. Picked it up from my little brother and sister-in-law. According to them that is the proper Italian way to drink it. While I still roll my eyes when I think about it, they do spend a few weeks there near Bologna every couple of years. Her family has been doing it for a few decades now.
That said, I'd never trust espresso out of a super fancy Keurig to actually be any good.
Please, tell your brother and sister-in-law that that is not the "proper italian way" to drink your espresso; it's just a habit of that family.
Drink it the way you like and enjoy it.
I'm italian, trust me