Question 68971
a= (2, 3, 4) & b= (3,4,5)

solve a u b
      A upisde down u b
If I'm understanding you right.
aub (read "a union b") is everything in a and everything in b
aub=(2,3,4,5)
:
anb (read "a intersect b") is only what both a and b have in common.
anb=(3,4)
:
Happy Calculating!!!!