Given 2 relations R1 and R2 where R1 contains N1 tuples and R2 contains N2 tuples and N2 > N1 > 0, give the minimum and maximum possible sizes (in tuples) for the resulting relation produced by each of the following relational expressions. In each case, state any assumptions about the schemas for R1 and R2 needed to make the expression meaningful. R1R2, R1R2, R1 X R2, R1-R2, a=5(R1), a(R1) , R1/R2.