Discussion 1

we have 11 believing in Ufo's and Ghost
And 2 that believe in all 3
42 that believe in ufo's
21 believe in bigfoot
45 believe in ghosts
6 believe in ghosts and bigfoot
4 believe in ufo's and big foot

once we add up all the regions, we get 131 people of all 3 sets.
160-131=29