Back to 13.5 Counting Principles

Solve counting problems using the addition principle.

Avg difficulty 2.5

ⓐ Seven red and five green marbles are placed in a bag. How many marbles are there to choose from?

ⓑ Let the set A = {−5,−3,−1,2,3,4,5,6}. How many ways are there to choose a negative or an even number from A?

ⓒ A student is shopping for a new computer. He is deciding among 2 desktop computers and 3 laptop computers. What is the total number of computer options?

OpenStax Algebra and Trigonometry 2e, 13.5 Counting Principles, exercise 1

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Adapted from College Algebra © 2021 Rice University. Licensed under CC BY 4.0. Sources: College Algebra 2e, Algebra and Trigonometry 2e, Precalculus 2e, College Algebra with Corequisite Support 2e. Imported at revision 4922e46.