x

Working backwards from a probability

Working backwards from a probability

Probability tree for two draws without replacement from x blue and 3 red counters, highlighting the blue then blue path and the changing fractions on the second draw

Probability equation questions ask you to work backwards from a known probability to an unknown number of counters. A tree diagram like the one above helps you keep track of what changes after the first draw.

Probability Equation Questions Lesson

  1. IGCSE
  2. /Maths
  3. /Probability Equation Questions

Step-by-step lessons covering Edexcel IGCSE Maths Probability Equation Questions 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

Quadratic Simultaneous EquationsTransforming Graphs y=f(x)ProofCompleting the SquareInverse and Composite FunctionsQuadratic InequalitiesSequences (Higher)DifferentiationVectors Proof QuestionsProbability Equation Questions