Solve counting problems using the addition principle.
ⓐ 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 · Example 1
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