Answer:
165
Step-by-step explanation:
Data provided in the question:
Initial Number of books available to read = 12
Number of books Pat took with him = 4
Since, 1 book has already been selected
Therefore,
The number of choices left = 12 - 1 = 11
Number of remaining books to be chosen = 3
Number of ways of choosing the remaining books = ¹¹C₃
= [tex]\frac{11!}{3!(11-3)!}[/tex]
= [tex]\frac{11\times10\times9\times8!}{3\times2\times1(8!)}[/tex]
= 990 ÷ 6
= 165
