Three citizens are passing by. You ask these three inhabitants: "How many among you are knights?"
The first replies: "There is none
The second says: here is only one
What will the third inhabitant say?
Bonus question: Here are 10 numbered statements in a notebook.
“Exactly one of these statements is true.” “Exactly two of these statements are true.” “Exactly three of these statements are true.”
.......
“Exactly ten of these statements are true.”
How many of them are true?
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