The licence plates of cars consist of 2 upper case letters followed by 4 digits,
in which first digit cannot be 0.
If letter I and O cannot be used and digits cannot be all same,then how many different licence plates are possible?
f5數學題一問?10點
2011-09-10 4:48 am
回答 (1)
2011-09-10 6:48 am
✔ 最佳答案
24 x 24 x (9000 - 9)= 5178816
2011-09-09 22:56:18 補充：
if letter I and O cannot be used, it remains 24 letters,
combination of 2 upper case letters : 24 x 24
if 1st digit cannot be 0, there are 9000 combinations from 1000 to 9999
and then less 9 combinations of all digits are same (1111, 2222 ...)
收錄日期: 2021-04-23 20:47:05
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20110909000051KK00650