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A certain school district has specified 5 different novels and 4 different non-fiction books...

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by BTGmoderatorLU » Mon Jun 29, 2020 4:49 am

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B

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Difficulty—

Source: Magoosh

A certain school district has specified 5 different novels and 4 different non-fiction books from which teachers can choose to assemble a summer reading list. Each summer reading list must have exactly 3 novels and 2 non-fiction books. How many different summer reading lists are possible?

A. 54
B. 60
C. 72
D. 120
E. 240

The OA is B
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Re: A certain school district has specified 5 different novels and 4 different non-fiction books...

by Jay@ManhattanReview » Tue Jun 30, 2020 12:13 am
BTGmoderatorLU wrote: ↑
Mon Jun 29, 2020 4:49 am
 Source: Magoosh

A certain school district has specified 5 different novels and 4 different non-fiction books from which teachers can choose to assemble a summer reading list. Each summer reading list must have exactly 3 novels and 2 non-fiction books. How many different summer reading lists are possible?

A. 54
B. 60
C. 72
D. 120
E. 240

The OA is B
No. of ways 3 novels can be chosen = 5C3 = (5.4.3.)/(1.2.3) = 10;
No. of ways 2 non-fiction books can be chosen = 4C2 = (4.3.)/(1.2) = 6;

Required no. of ways = 10*6 = 60

Correct answer: B

Hope this helps!

-Jay
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Re: A certain school district has specified 5 different novels and 4 different non-fiction books...

by ssrivastava » Tue Jun 30, 2020 3:53 am
3 novels can be selected out of 5 in 5C3 ways.
2 non fiction books can be selected out of 4 in 4C2 ways.

since the question involves "and" we will multiply both. Thus, Ans is 60
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Re: A certain school district has specified 5 different novels and 4 different non-fiction books...

by Scott@TargetTestPrep » Mon Apr 19, 2021 6:15 am
BTGmoderatorLU wrote: ↑
Mon Jun 29, 2020 4:49 am
 Source: Magoosh

A certain school district has specified 5 different novels and 4 different non-fiction books from which teachers can choose to assemble a summer reading list. Each summer reading list must have exactly 3 novels and 2 non-fiction books. How many different summer reading lists are possible?

A. 54
B. 60
C. 72
D. 120
E. 240

The OA is B
Solution:

The number of ways to choose 3 novels from 5 is 5C3 = (5 x 4 x 3)/(3 x 2) = 10, and the number of ways to choose 2 non-fiction books from 4 is 4C2 = (4 x 3)/2 = 6. Therefore, the number of ways to choose 3 novels and 2 non-fiction books is 10 x 6 = 60.

Answer: B

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