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Probability Equation Questions
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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 on Edexcel IGCSE Maths Probability Equation Questions. Each one builds up to exam-style questions. 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