Two brothers belong to a club with 10 members. Four are selected for a match. Find the probability that both brothers are selected.
You and I play a game involving successive throws of a fair coin. Suppose I pick HH and you pick TH. The coin is thrown repeatedly until we see either two heads in a row (I win) or a tail followed by. . . .
Can you work out which spinners were used to generate the frequency charts?
Invent a set of three dice where each one is better than one of the others?
Will the witch make a profit or loss?
A bag contains red and blue balls. You are told the probabilities of drawing certain combinations of balls. Find how many red and how many blue balls there are in the bag.