Question

King Novelty sells exactly three products. 70% of their customers have bought the first
product, 60% have bought the second product, 50% have bought the third product. 30%
have bought both the first and second, 25% have bought both the first and third, and 20%
have bought both the second and third. How many have bought all three products?

Answer 1

(a) 1% (b) 5% (c) 10% (d)20% (e) 80%

Answer 2

formula: n(AUBUC) = n(A)+n(B)+n(C)-n(AnB)-n(BnC)-n(CnA)+n(AnBnC)

Answer 3

so...
180-30-20-25=105 and then im confused about the next step....

Answer 4

BTW, the U and n in the parenthesis are U for Union and n (upside down U) for Intersection

Answer 5

@Mertsj