Aclass is divided into 4 groups. a bag contains pieces of paper that are red, blue, green, and yellow. for every blue- or green-colored piece of paper, there are 2 red- and 2 yellow-colored pieces of paper. the students are asked to pick a piece of paper to be put into a particular colored group. what is the probability that the first student will randomly pick a red-colored piece of paper or a blue-colored piece of paper?