Good Riddles

 
Riddle #404 (medium)

Question: You get trapped in a psycho's mansion during a power outage. You try to get out by going through a series of rooms: the first one is blue, the second one is also blue, but the third one is golden. After you go through all of these rooms you find the psycho. He tells you that you must hold your breathe under water for 10 minutes, wrestle a large bear, or sit in the electric chair for ten seconds while it is on.

Which should you choose?

Question: How do you make the number one disappear by adding to it?

Riddle #543 (medium)

Question: How many letters are in the answer to this riddle?

Riddle #760 (medium)

Question: I'm number three.
But I'm not a number.
I'm hot and cold at the same moment but not at the same time.
I'm number three.
But I'm not a number.

Who or what am I?

Question: You have a bag with 'N' strings in it. You randomly grab two ends and tie them together until there are no more loose ends.

In the end, what is the expected number of loops (strings tied to their own end)?