If we put 5 math, 6 biology, 8 engineering, and 3 physics books on a bookshelf at random, what is the probability that all the math books are together?

Respuesta :

Answer: [tex]\dfrac{3}{4389}[/tex]

Step-by-step explanation:

Given : Number of math books = 5

Total number of books = 5+6+8+3=22

Number of books except math = 17

Number of ways to arrange 22 books in bookshelf = [tex]22![/tex]

When all math books are together , then we count whole set as one

Now, the number of objects in bookshelf = 17+1=18

Number of ways to arrange books such that all math books are together = [tex]18!5![/tex]

Now, the probability that all the math books are together :-

[tex]\dfrac{5!18!}{22!}=\dfrac{3}{4389}[/tex]

Hence, the probability that all the math books are together [tex]=\dfrac{3}{4389}[/tex]