9000139706

SubArea: 
Combinatorics
Level: 
A
Project ID: 
9000139706
Source Problem: 
2010007005
Accepted: 
1
Clonable: 
1
Easy: 
0
The international alphabet contains 26 letters. The letters of this alphabet and the digits from 0 to 9 are used to form a code of the length 4 (a code contains 4 characters). The characters may repeat through the code and the code is not case sensitive (uppercase letters are equivalent to lowercase letters). How many codes can be obtained?
364=1679616
10⋅264=4569760
36!32!4!=58905
26!22!4!=14950