9000139709

SubArea: 
Combinatorics
Level: 
A
Project ID: 
9000139709
Source Problem: 
2010007006
Accepted: 
1
Clonable: 
1
Easy: 
0
Find the number of possible ways how to organize a group of 10 children in one ordered row if Mike and Paul should be next to each other.
2⋅9!=725760
10!=3628800
10!2!=1814400
10!8!=90