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?

Can you make numbers like 24, using numbers 3,3,7 & 7 with any arithmetic operator?

A blonde put eyeliner on her head. Why?

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

I have branches, but no fruit, trunk or leaves. What am I?

A boy and his father are caught in a traffic accident, and the father dies. Immediately the boy is rushed to a hospital, suffering from injuries. But the attending surgeon at the hospital, upon seeing the boy, says 'I cannot operate. This boy is my son.' How is this situation explained?

Can you find the dog hidden in a group of pandas?

Can you find out the remainder when 3^300 is divided by 5?

Which five letter word can be added at the end of below word to form a
valid word?

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It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?