![Let S = 1, 2, 3, 4, 5, 6, 7 . Then the number of possible functions f : S → S such that fm· n=fm· fn for every m,n∈ S and m· n∈ S is equal to Let S = 1, 2, 3, 4, 5, 6, 7 . Then the number of possible functions f : S → S such that fm· n=fm· fn for every m,n∈ S and m· n∈ S is equal to](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/1472403/original_9S.png)
Let S = 1, 2, 3, 4, 5, 6, 7 . Then the number of possible functions f : S → S such that fm· n=fm· fn for every m,n∈ S and m· n∈ S is equal to
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