Chapter 11 - Probability and Statistics - 11-1 Permutations and Combinations - Practice and Problem-Solving Exercises - Page 678: 16

$665,280$

Divide the factorial by simplifying: $\dfrac{12!|}{6!} = \dfrac{12*11*10*9*8*7*6*5*4*3*2*1}{6*5*4*3*2*1}$ Cancel the common factors you get : $\dfrac{12!}{6!} = 12\times 11 \times 10 \times 9 \times 8 \times7\\ \dfrac{12!}{6!} =665,280$