Theoretical probability

To win on a scratch card you have to uncover three numbers that add up to more than fifteen. What is the probability of winning a prize?

A counter is placed in the bottom right hand corner of a grid. You toss a coin and move the star according to the following rules: ... What is the probability that you end up in the top left-hand corner of the grid?

Find out about the lottery that is played in a far-away land. What is the chance of winning?

You'll need to work in a group for this problem. The idea is to decide, as a group, whether you agree or disagree with each statement.

Bipin is in a game show and he has picked a red ball out of 10 balls. He wins a large sum of money, but can you use the information to decided what he should do next?

Mrs. Smith had emptied packets of chocolate-covered mice, plastic frogs and gummi-worms into a cauldron for treats. What treat is Trixie most likely to pick out?

When you throw two regular, six-faced dice you have more chance of getting one particular result than any other. What result would that be? Why is this?

Heads or Tails - the prize doubles until you win it. How much would you pay to play?

If the score is 8-8 do I have more chance of winning if the winner is the first to reach 9 points or the first to reach 10 points?

This article, for students and teachers, is mainly about probability, the mathematical way of looking at random chance and is a shorter version of Taking Chances Extended.