can someone please help me solve these:

consider a set S of all students, taking some courses chosen from a set of C courses: what are the binary relations?

R1= (S1,S2) : S1 and S2 take all the same courses together

R2=(S1,S2) : s1 and S2 take some courses together

are either equivalence relations too?

thanks a lot i would appreciate the help ^_^