Question

A single die is rolled one time. What is the probability of rolling a number greater than 5 or less than 3?

Answer 1

The die is assumed to have six sides labeled `1, 2, 3, 4, 5, 6`
The numbers greater than 5 are `6`.
The numbers less than 3 are `2, 1`.

So the numbers greater than 5 OR less than 3 are the union of the two sets or 6, and 2,1. The probability of rolling one of these numbers is `3/6=1/2` or `50%`.