Lesson 2 of 4 · Form 3 Mathematics
Probability
18 min
Basics
P(event) = number of favourable outcomes ÷ total outcomes
- 0 ≤ P ≤ 1
- P(not A) = 1 - P(A)
Combined events
- Mutually exclusive (cannot happen together): P(A or B) = P(A) + P(B)
- Independent (one does not affect the other): P(A and B) = P(A) × P(B)
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