Помогите с номером 5

Question

Помогите с номером 5

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Answer 1

1234,1243,1324,1342,1423,1432,2134,2143,2314,2341,2413,2431,3124,3142,3214,3241,3412,3421,4123,4132,4213,4231,4312,4321
4321-1234=3087