How many people believ in Ghots , Big foot or UFOS

42 BELIVED IN UFOS
21 BELIEVED IN BIGFOOT
6 GHOTS AND BIG FOOT
2 BELIVED IN ALL THREE
45 BELIVED IN GHOTS
11 UFOS AND GHOTS
4 UFOS AND BIGFOOT


(U U G u B) n ~(B n G n U )

N(B) = 75