set A = (a,b,c,d,e) and set B = (a,d,e,g). AUB is

A.(D,e)
B.(2a,b,c,2d,2e,g)
C.(a,b,c,d,e,g)
D.(b,c,g)

2 answers

https://en.wikipedia.org/wiki/Union_(set_theory)
in A, in B or in both
6ab