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Carol is having friends over to watch home movies. She has 6 reels of home movies, but she and her friends have time to

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by M7MBA » Thu Sep 17, 2020 1:46 am

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Answers

A

B

C

D

E

Stats

Difficulty—

Carol is having friends over to watch home movies. She has 6 reels of home movies, but she and her friends have time to watch only 3 of them. Carol must decide which reels to watch and in what order. How many different orderings does Carol have from which to choose?

A. 120
B. 96
C. 60
D. 36
E. 20

Answer: A

Source: Princeton Review
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Re: Carol is having friends over to watch home movies. She has 6 reels of home movies, but she and her friends have time

by swerve » Thu Sep 17, 2020 5:03 am
M7MBA wrote: ↑
Thu Sep 17, 2020 1:46 am
 Carol is having friends over to watch home movies. She has 6 reels of home movies, but she and her friends have time to watch only 3 of them. Carol must decide which reels to watch and in what order. How many different orderings does Carol have from which to choose?

A. 120
B. 96
C. 60
D. 36
E. 20

Answer: A

Source: Princeton Review
First reel can be chosen in \(6\) ways.

Second reel has to be one out of remaining \(5\), so it can be chosen in \(5\) ways.

Third reel has to be one our of the remaining \(4\) , so it can be chosen in \(4\) ways.

So, the total ways \(= 6 \cdot 5 \cdot 4 = 120\)

Hence, the correct answer is A
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