Relational Database - Find Cardinality, Intro to database

Thank you!!

Consider the relations: RI(A, B, C), with referential integrity constraint between B, C and the key of R2, and with cardinality 100 R (D, E, F), with referential integrity constraint between F and R3, and with cardinality 200 R3(G, H, I), with cardinality 50 Find the cardinality of each of the following expressions (where A means AND), specifying the range (max and min) using both the relation symbols (e.g. IR1D and the numbers 1. PROJ AB (Ri) 2. PROJ Bc (R) 3. (Ri JOIN (B-D)A(C-E) R2) JOIN (F-G) R3 4. (Ri JOIN R2)JOIN (F-G) R