Answer to Question #272077 in Discrete Mathematics for Aman

Question

Counting subsets of Finite sets: A student can choose a computer project from one of

three lists. The three lists contain 23, 15 and 19 possible projects, respectfully. No project is

on more than one list. How many possible projects are there to choose from?

Answer 1

By the sum rule, there are $23+15+19=57$  ways to choose a project.