Roxie is picking out some movies to rent, and she is primarily interested in horror films...

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Roxie is picking out some movies to rent, and she is primarily interested in horror films...

Roxie is picking out some movies to rent, and she is primarily interested in horror films and foreign films. She has narrowed down her selections to 20 horror films and 8 foreign films.

Step 2 of 2 :

How many different combinations of 3 movies can she rent if she wants at least two horror films?

math Statistics-And-Probability

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Answer 1

Answer #1

x horror films can be selected from n horror films by ⁿC_x ways. .

n(At last 2 horror film) = n(2 horror film) + n(3 horror films)

= ²⁰C₂ * ⁸C₁ + ²⁰C₃

= 2660

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Answer 2

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