2. Question 2-Relations We now consider the set S of all students enrolled in this section of eecs 2001. There are 150 students enrolled. (You don't need to know their names or student IDs to answer this question.) Below we define two relations R1 and R2 on the set S {81, 82, 83, ...,S150}. For both relations determine whether it is an equivalence relation and explain why or why not. For the first relation R, we define two students si and s; to be related and write siR1s; if their sets A (from Question 1) have the same size. For the second relation R2, we define two students si and s; to be related and write siR28; if they have taken at least 4 different classes together