6) Patrick has a bag of orange and yellow M&Ms. He chooses one without looking 18 times. If he
chooses an orange M&M 6 times, how many
yellow M&Ms can he expect from 80 tries?

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.