Chris and Jo put two red and four blue ribbons in a box. They each
pick a ribbon from the box without looking. Jo wins if the two
ribbons are the same colour. Is the game fair?
Identical discs are flipped in the air. You win if all of the faces
show the same colour. Can you calculate the probability of winning
with n discs?
Is this a fair game? How many ways are there of creating a fair
game by adding odd and even numbers?
7 balls are shaken in a container. You win if the two blue balls
touch. What is the probability of winning?
Six balls of various colours are randomly shaken into a trianglular
arrangement. What is the probability of having at least one red in
This interactivity invites you to make conjectures and explore
probabilities of outcomes related to two independent events.
Move your counters through this snake of cards and see how far you
can go. Are you surprised by where you end up?
Some people offer advice on how to win at games of chance, or how
to influence probability in your favour. Can you decide whether
advice is good or not?
Engage in a little mathematical detective work to see if you can spot the fakes.
Imagine flipping a coin a number of times. Can you work out the
probability you will get a head on at least one of the flips?
Alison and Charlie are playing a game. Charlie wants to go first so Alison lets him. Was that such a good idea?
A collection of short Stage 3 problems on probability.