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faltersainse [42]
3 years ago
7

Help ASAP! Nobody has the right answer to this!

Mathematics
2 answers:
Sedbober [7]3 years ago
6 0

Answer:

Option D

Step-by-step explanation:

Given :  Christina is randomly choosing 3 movies to take on vacation from 9 action movies, seven science fiction movies, and four comedies.

To find : Which statement is true?

Solution :

Total number of movies 9 + 7 + 4 = 20

The total number of combinations of choosing 3 movies from a pool of 20 is represented by ^{20}C_3

Since there are 9 action movies in total and we're choosing 3, the number of combinations to do that is  ^{9}C_3

So the probability of choosing all action movies is the combinations of choosing all action movies divided by all the possible combinations of choosing any 3 movies from 20.

=\frac{^{9}C_3}{^{20}C_3}

Therefore, the probability of not choosing all action movies is

=1-\frac{^{9}C_3}{^{20}C_3}

Hence, Option D is correct.

liubo4ka [24]3 years ago
4 0
Best answer to this would be the probability that Christina will choose three action movies can be expressed as 20C3/9C3 .
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Given : Strands Copper wire from a manufacturer are analyzed forstrenghth and conductivity. The Results from 100 strands are as follows :

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