Answer:
5005
Step-by-step explanation:
6 C 15
(6, 15)
15! / (6! x 9!)
The answer is 5005
C is just a way to say the order the books are picked in is random and ! means factorial. Factorial is when you multiply all the previous numbers up to the number it is. For example, 5! = 1 x 2 x 3 x 4 x 5 and 2! = 1 x 2
