Among 100 people, 52 are male, 87 are right-handed and 43 are both. What is the probability that a person is male or right-handed?

1. The union is the sum of the two counts less the count shared by both. 2. That gives 52 plus 87 minus 43, which is 96 people. 3. Dividing 96 by 100 gives a probability of 0.96. 4. Adding 52 and 87 without subtracting the 43 gives 1.39, and no probability may exceed one. _Source: OpenStax Introductory Business Statistics (CC BY 4.0), Ch 3 "Probability Topics", section 3.1 Terminology_