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?