The chances of one event OR another event occurring
the sum of the chances of each event separately.
In somewhat shorter form, let’s call the first event E1 and the second event
E2. In this case E1 would be winning the washer-dryer, E2 would be winning the toaster. And
let’s abbreviate “the probability of E1” to simply P(E1). Then we
P(E1or E2) = P(E1) + P(E2)
This looks a lot more official and impressive, but remember that the basic
idea is, add the chances together if you want to know the probability of one
thing or another thing.
What is the probability of winning any of the non-tropical-getaway prizes?