Formula to find probability for multiple event?

Formula to find multiple event :

Probability of event A that occurs P(A) = n(A) / n(S).
Probability of event A that does not occur P(A) = 1 - P(A).
Probability of event B that occurs P(B) = n(B) / n(S).
Probability of event B that does not occur P(B) = 1 - P(B).
Probability that both the events occur P(A ∩ B) = P(A) x P(B).
Probability that either of event occurs P(A ∪ B) = P(A) + P(B) - P(A ∩ B).
Conditional Probability P(A | B) = P(A ∩ B) / P(B).

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