A market research group conducted a survey of 1000 consumers and reported that 720 consumers liked product A and 450 consumers liked product B. What is the least number that must have liked both products ?
(a) 170
(b) 280
(c) 220
(d)
Correct option (a) 170
Explanation:
Let U be the set of consumers questioned X, the set of consumers who liked the product A and Y, the set of consumers who liked the product B. Then n (U) = 1000,
