Traditional Culture Encyclopedia - Photography and portraiture - Photography Xiaoming Huli
Photography Xiaoming Huli
The formula of permutation and combination is c (subscript 3) (superscript 1)*C (subscript 2) (superscript 1)*C (subscript 1) (superscript 1)=3*2* 1=6 kinds.
Explanation: consider Xiaoli first, she has three choices; After Xiaoli was selected, Xiaoming went on to choose. He has only two choices. After two people choose, Xiaowen has no choice, so 3*2=6 kinds.
Specific circumstances:
Mary
leveret
Xiao Ming
birdie
Xiaowen
fox
Mary
leveret
Xiao Ming
fox
Xiaowen
birdie
Mary
birdie
Xiao Ming
leveret
Xiaowen
fox
Mary
birdie
Xiao Ming
fox
Xiaowen
leveret
Mary
fox
Xiao Ming
birdie
Xiaowen
leveret
Mary
fox
Xiao Ming
leveret
Xiaowen
birdie
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