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標題:
f5數學題一問?10點
發問:
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?
最佳解答:
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 ...)
其他解答:6A560DB68EC65D60
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