Question

A class 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?

What additional information would be required to solve the problem?