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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 CIE IGCSE Maths Probability Trees for Core and Extended tier. Each lesson works through exam-style questions in Paper 1 and Paper 3 (Core) or Paper 2 and Paper 4 (Extended) format. Start with the Core-tier fundamentals in number and algebra before moving on to the more demanding Extended-only topics like calculus-adjacent algebra and advanced trigonometry.

Lessons

Recurring Decimals to FractionsFractional and Negative IndicesDirect and Inverse ProportionExpanding Triple BracketsSolving Simultaneous Equations GraphicallyGradient of a LineEquation of a LineSpheres and ConesSector Areas and Arc LengthsParallel and Perpendicular LinesSimilar Shapes (Area and Volume)Circle TheoremsCumulative FrequencyProbability Trees