OpenStax, Algebra and Trigonometry 2e §13.7 Probability · Review Exercise 94 · Probability · Counting & chance

Probability · Review Exercise 94

In a group of $20$ musicians, $12$ play piano, $7$ play trumpet, and $2$ play both piano and trumpet. How many musicians play either piano or trumpet?

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OpenStax, Algebra and Trigonometry 2e · §13.7 Probability · Review Exercise 94

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