The probability for success of an event is P (A), and the probability of success of a second event is P (B). What is the probability of both events occurring, in that order?

A. P (A + B)

B. P (A) • P (B)

C. P (A) + P (B)

D. P (A x B)

D. P (A x B)

To work out the success of both events you have to multiply them together. I'd seriously reccomend learning this rule as it's very important later on in mathematics as it's basically the foundation of all probability statistics.