Probability from equally likely outcomes

Favourable outcomes over total outcomes, and the equally likely condition.

An event made of several outcomes

Counting every outcome an event contains before dividing by the total.

Fairness and selecting at random

What fair, biased and at random mean, and when counting stops being valid.

Practice

Probability from equally likely outcomes

Favourable outcomes over total outcomes, and the equally likely condition.

Practice

An event made of several outcomes

Counting every outcome an event contains before dividing by the total.

Practice

Single events review

Probability scale, the not-rule and expected frequency.

Mixed review