标题:
[讨论]math
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作者:
jackco
时间:
2002-11-2 16:10
标题:
[讨论]math
among 100 to 999, how many integers have no the digit 2 and 5?
the jj answer is 448, how to get it?
作者:
猫猫头
时间:
2002-11-2 16:13
百分位1-9共可以用7个
十分位0-9可以用8个
个位可以用8个
7*8*8=448
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