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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 Oxford AQA IGCSE Maths Probability Equation Questions for Core and Extended tier. Each lesson works through exam-style questions in Paper 1 and Paper 2 (Core: 1C and 2C; Extension: 1E and 2E) format. Since content from any part of the specification can appear on either paper, keep number and algebra fluency sharp throughout the course rather than leaving it until near the exam.

Lessons