x

Probability and complements

Probability and complements

Probability is a number from 000 to 111, where 000 means impossible and 111 means certain. For equally likely outcomes such as counters or cards, use the following formula:

Probability Trees Lesson

  1. IGCSE
  2. /Maths
  3. /Probability Trees

Step-by-step lessons covering Edexcel IGCSE Maths Probability Trees for IGCSE Maths. Each lesson works through exam-style questions in Paper 1 and Paper 2 format. Build confidence with the shared Foundation-tier content first, since roughly 40% of Higher-tier marks are targeted at the grades 4–5 boundary that both tiers have in common.

Lessons