Question 747460
Person a = .80
Person b = .60

We use the addition rule for the probability of A or B which says:
The probability that 2 events A or B will occur P(a or b) is given by the equation:
P(a or b) = P(a) + P(b) - P(a*b)

P(a or b) = P(.80) + P(.60) - P(.80*.60)
P(a or b) = 1.4-.48
P(a or b) = .92