Please explain. I will upvote best answer

14(50) There are three relation: How many tuples would there be in RAST natural join Tc,d) = {(2,3), (6,7), (10,11), (10,3)} R(a,b) = {(0,1), (4,5), (8,9)} s(bec) = {(1,2), (5,2), (5,6), (5,10), (13,10)}