$P(A \text{ and } B) = P(A) \times P(B)$

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

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

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