Answer:
450,000 will buy both a printer and at least one software package
Explanation:
A (size 650,000) is the set of printer buyers
B (size 1,250,000) is the set of software buyers
(A or B) (size 1,450,000) is the set of people buying either a printer or software package.
(A and B) is the set of people buying both a printer and at least one software package
According to the inclusion–exclusion principle in set theory, we have:
(A or B) = A + B - (A and B)
So (A and B) = A + B - (A or B) = 1,250,000 + 650,000 - 1,450,000 = 450,000
