Calculating Probabilities & Events (AQA A-Level Mathematics): Flashcards

$P(E) = \frac{\text{favourable outcomes}}{\text{total outcomes}}$

$P(E') = 1 - P(E)$

Event that $E$ does not occur

Events that cannot occur at the same time

$P(A) + P(B)$

Occurrence of one does not affect the other

$P(A) \times P(B)$

$\frac{P(A \text{ and } B)}{P(B)}$

$P(A) + P(B) - P(A \text{ and } B)$

$P(A) \times P(B|A)$