9000148909

SubArea: 
Combinatorics
Level: 
A
Project ID: 
9000148909
Source Problem: 
2010007105
Accepted: 
1
Clonable: 
1
Easy: 
0
There are 24 girls and 8 boys in the class. How many ways are there to designate a president and vice-president of the class if it is required that one of the position will be held by a boy and the other one by a girl?
24⋅8⋅2=384
24⋅8=192
32!2!30!=496
32!24!8!=10518300