IP EMaths Notes (Upper Sec, Year 3-4): 14) Probability
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Compute probabilities with mutually exclusive, independent, and conditional events using organised tables or tree diagrams.
Last updated 30 Nov 2025
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- Start Here
- Quick reference
- Organising your work
- Mutually exclusive vs independent
Q: What does IP EMaths Notes (Upper Sec, Year 3-4): 14) Probability cover?
A: Compute probabilities with mutually exclusive, independent, and conditional events using organised tables or tree diagrams.
Start Here
| Read time | What to take away |
| 1 second | Organise outcomes first, then multiply along paths and add across allowed cases. |
| 10 seconds | Mutually exclusive means events cannot happen together. Independent means one event does not change the other. Conditional probability narrows the sample space before dividing. |
| 100 seconds | Use the counter, table, and tree examples to practise choosing the right layout, writing the denominator clearly, and using complements for "at least" questions. |
Probability questions reward tidy organisation. Label events clearly, state whether they are mutually exclusive or independent, and keep notation consistent across tables and tree diagrams.
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These notes align with SEAB GCE O-Level Mathematics (4052) content used in IP programmes (exams from 2026).
Status: SEAB O-Level Mathematics 4052 syllabus (exams from 2026) checked 2025-11-30 - scope unchanged; remains the reference for these notes.
