What is 3/7 chicken, 2/3 cat and 2/4 goat?

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 throw two dice simultaneously.

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

They are the five precious gems of an everyday sort and all can be found on a Tennis Court. Who are they?

A sea diver is a real show-off. He showed everyone that he can hold his breath underwater for 15 minutes.

I went to the diver and told him that I can be underwater for double the time i.e 30 minutes.
He responded that he will give me 100$ if I would be able to do it. I won 100$.

What did I do?

Can you divide the below-given shape into four equal and identical pieces?

There is a bag which have 21 blue balls and 23 red balls. You also have 22 red balls outside the bag. Randomly remove two balls from the bag. * If they are of different colors, put the blue one back in the bag. * If they are the same colour, take them out and put a red ball back in the bag. Repeat this until only one ball remains in the bag. What is the color of the sole ball left in the bag ?

What is the word or phrase?

A Child was born in Lahore, Pakistan.

Still child is not a Pakistani citizen.why ?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?