The following question involve the three relation below:
1) R(a,b) = {(0,1), (4,5), (8,9)}
2) S(b,c) = {(1,2), (5,2), (5,6), (5,10), (13,10)}
3) T(c,d) = {(2,3), (6,7), (10,11), (10,3)}
The number of tuples in R ⋈ S ⋈ T, where ⋈ is the natural join is:
1
5
2
8
3
10
4
13