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https://web2.0calc.com/questions/need-help

 May 18, 2021
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dave puts a collection of 15 books on the shelf in a random order. Among the books are 2 fiction and 13 non-fiction books. what is the probability that the two fiction books will be together on the left side of the shelf and the 13 non-fiction all together on the right side of the shelf?

 

Here is my best guess

 

total number of ways books can be arranged    15 !

  two fictions together have two ways to be arranged while the remaining slots   13!

 

2 * 13! / 15!

 May 18, 2021
edited by ElectricPavlov  May 18, 2021

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