SOLUTION: A boxed DVD set contains 21 movies from a certain studio. Twelve of them are comedies, six are thrillers, and three are dramas. What is the probability that one DVD chosen from the

Question 269628: A boxed DVD set contains 21 movies from a certain studio. Twelve of them are comedies, six are thrillers, and three are dramas. What is the probability that one DVD chosen from the box at random is a thriller or a drama? Show step by step work! Give answer as a fraction in lowest terms.
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
A boxed DVD set contains 21 movies from a certain studio.
Twelve of them are comedies, six are thrillers, and three are dramas.
What is the probability that one DVD chosen from the box at random is a thriller or a drama? Show step by step work! Give answer as a fraction in lowest terms.
---
P(thriller or drama) = P(thriller) + P(drama)
= 6/21 + 3/21
= 9/21
= 3/7
==========
cheers,
Stan H.

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