作业帮SAT数学题排列组合题求解答
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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}
The filing system in an office requires each file to have an alphanumeric code name of the form abc.A,B and C are the sets from which a,b,and c must be chosen.How many possible code names are there?
A={A,B,C,D,E,F,G}
B={0,1,2}
C={1,2,3,4,5,6,7,8,9}
The filing system in an office requires each file to have an alphanumeric code name of the form abc.A,B and C are the sets from which a,b,and c must be chosen.How many possible code names are there?
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
7x3x9=189