There was once a college that offered a class on probability applied to the real world. The class was relatively easy, but there was a catch. There were no homework assignments or tests, but there was a final exam that would have only one question on it. When everyone received the test paper it was a blank sheet of paper with a solitary question on it: 'What is the risk?'.Most students were able to pass, but only one student received 100% for the class! Even stranger was that he only wrote down one word!
What did he write?

I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

What does below Rebus mean ?

esgg sgeg gegs gsge

There are nine letters in the below-given diagram. You have to form a nine-letter word using these letters.

Irene killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

There are people and strange monkeys on this island, and you can not tell who is who (Edit: until you understand what they said - see below). They speak either only the truth or only lies.
Who are the following two guys?
A: B is a lying monkey. I am human.
B: A is telling the truth.

Solve the following series:
AZ, GT, MN, __, YB

This is a simple one. You just have to count the number of Fs in the given sentence.

Finished Files are the result of years of scientific study combined with the experience of years.

How many did you count?

What is red and smells like blue paint?

Buy me, smell me or deliver me, I do not change.

Who am I?