What is the complement of the event "18-34" for the survey mentioned above? Hint: Use the plus symbol like it is used in 65+. What is the complement of the event "18-34" for the survey mentioned above? Hint: Use the plus symbol like it is used in 65+. 34 - 65+ 35 - 49 35+ All of the above event that a California adult is less than 65 years old can be written as the event "NOT 65+." These two events, 65+ and NOT 65+, are referred to as complements because the sum of their probabilities is equal to 1. More generally, for any event A, we can think of the probability of complements as having the following relationship: P(A) + P(NOT A) = 1 The equation can be rewritten as follows: P(NOT A) = 1 - P(A) This tells us that for event A, the probability that the event will not occur is equal to 1 minus the probability that the event will occur