问题标题：
SAT数学题排列组合题求解答A={A,B,C,D,E,F,G}B={0,1,2}C={1,2,3,4,5,6,7,8,9}Thefilingsysteminanofficerequireseachfiletohaveanalphanumericcodenameoftheformabc.A,BandCarethesetsfromwhicha,b,andcmustbechosen.Howmany
问题描述：
SAT数学题排列组合题求解答
A={A,B,C,D,E,F,G}
B={0,1,2}
C={1,2,3,4,5,6,7,8,9}
Thefilingsysteminanofficerequireseachfiletohaveanalphanumericcodenameoftheformabc.A,BandCarethesetsfromwhicha,b,andcmustbechosen.Howmanypossiblecodenamesarethere?
宋建海回答：
简单来说就是从abc三个组里面一样拿一个,问有多少种方法.
7x3x9=189
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