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?

What does an Island and the letter T have in common?

There is a box in which distinct numbered balls have been kept. You have to pick two balls randomly from the lot.

If someone is offering you a 2 to 1 odds that the numbers will be relatively prime, for example
If the balls you picked had the numbers 6 and 13, you lose $1.
If the balls you picked had the numbers 5 and 25, you win $2.

Will you accept that bet?

In the given figure, you can see that four match sticks are used to form a square. Can you form five squares by using six matches?

Arrange the numbers 1, 2, 3, 4, 5, 6, 7, 8 and 9 above and below the division line in a manner that the thus formed fractions equal to 1/3.

(You can use one number only once)

Find three whole, positive numbers that have the same answer when multiplied together as when added together.

I know a ten-letter word in the English language which can be typed using only the top rows of the computer keyboard.

What is the riddle which can be asked all day with a different correct answer each time.

What goes through cities and fields, but never moves?

In a football game, Christina defeated Teresa by 2 - 0 but no man from either side scored. How can this be possible?