In a town 45% population read magazine A, 55% magazine B, 40% read Magazine C, 30% read magazines A and B, 15% read magazines B and C, 25% read magazines A and C and 10% read all the three magazines. What percentage do not read any magazine?
Q1. In a town 45% population read magazine A, 55% magazine B, 40% read Magazine C, 30% read magazines A and B, 15% read magazines B and C, 25% read magazines A and C and 10% read all the three magazines. What percentage do not read any magazine?
Answer: 20%
Explanation: Using inclusion-exclusion: P(A∪B∪C) = 45+55+40−30−15−25+10 = 80%. Those who read no magazine = 100−80 = 20%.