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标题: [求助]天山 4-Q22 [打印本页]

作者: woodruff1    时间: 2005-7-6 13:10     标题: [求助]天山 4-Q22

天山 4-Q22 math

How many 4-digit positive integers are there in which all 4 digits are even?

A.625 B.600 C.500 D.400 E.256

各位NN幫幫忙 ,,我,,我竟然看不太懂題目在幹麻,,


作者: dhhgh11    时间: 2005-7-6 13:29

digits, 0, 2, 4, 6, 8

=>4 * 5 * 5 * 5

答案是B


作者: woodruff1    时间: 2005-7-7 13:28

thanks    a    lot  !!!!




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