Question

Suppose the probability of an event occurring is P(A), and the probability of the event not occurring is P(A’). If P(A)= x and P(A’)= y, which of the following equations must be true

Answer 1

The correct answer is A) t = 1-s.

The probability of the complement of an event is the probability of the event subtracted from 1; in other words

P(A') = 1 - P(A)

Since P(A') = t and P(A) = s,  

t = 1-s