国际顶尖MBA申请交流平台--TOPWAY MBA

标题: ask math, thanks [打印本页]

作者: qqqqhhhh 时间: 2003-3-1 10:03 标题: ask math, thanks

how many 3 digit numerials begin wtih a digit that represent a prime number and end with a digit that represents aprime digit
ans:160

作者: passerr 时间: 2003-3-1 11:34

C4,1 * C10,1 * C4,1

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