Combined Events/Bernouilli Trials (Leaving Cert Mathematics): Flashcards

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

Either event A or event B (or both) occur

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

$\frac{13}{52} = \frac{1}{4}$

$\frac{4}{52} = \frac{1}{13}$

$\frac{16}{52} = \frac{4}{13}$

$\frac{4}{52} = \frac{1}{13}$

$\frac{3}{51} = \frac{1}{17}$

$\frac{1}{13} \times \frac{1}{17} = \frac{1}{221}$

To avoid counting the overlap twice