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Omni-MATH / Compute the number of functions f:1,2,…,9→1,2,…,9 which satisfy f(f(f(f(f(x)))))= x for each x∈1,2,…,9. · Discussion

Discussing Compute the number of functions f:{1,2,…,9}→{1,2,…,9} which satisfy f(f(f(f(f(x)))))= x for each x∈{1,2,…,9}. · Omni-MATH

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