What's the only room from which no one can enter or leave

Can you circle exactly four of these numbers such that the total is twelve?

1 6 1
6 1 6
1 6 1
6 1 6

What is the next number in this series?

4,12,84,3612....

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

What have one eye but still cannot see?

There was a blind man. He had four socks in his drawer either black or white. He opened it and took out two socks. Now the probability that it was a pair of white socks is 1/2.

Can you find out the probability that he had taken out a pair of black socks ?

I’m orange, I wear a green hat and I sound like a parrot. What am I?

I throw two dice simultaneously.

What is the probability of getting a sum as 9 of the two numbers shown?

Which flower has two lips?

What building has the most stories?