GCSE Maths Probability Mistakes
Probability questions often require careful organisation. Mistakes happen when students rush tree diagrams, fractions or event wording.
Common Probability Mistakes
- Forgetting probabilities must add to 1
- Adding when multiplication is needed
- Misreading “and” and “or”
- Not updating probabilities without replacement
Exam tip: In tree diagrams, multiply along branches and add different successful routes.
Common mistake: Without replacement means the second probability may change.
Video explanation
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