At a pizza shop, 80% of the customers order a pizza, 1 5% of the customers order a salad, and 10% of the customers order both a pizza and a salad. if a customer is chosen at random, what is the probability that he or she orders either a pizza or a salad?

The first one, i believe, would be correct. all the others have one thing in common, and that's that they have repeating numbers. in the second one, x and y have repeating 6's and 3's, and in the third, x and y have repeating 6's as well. in the last one, there are repeating 3's. the first one has no repeating numbers.