The Probability of an event E is defined as P(E) = n(E) / n(S), where n(S) represents the total number of possible outcomes in the sample space S. The options for calculating the probability are: A. n(E) / n(S), B. n(E) + n(S) - n(E ∩ S), C. n(E) x n(S), D. None of these.