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Omni-MATH / Let S=1,2,…,9. Compute the number of functions f:S→S such that, for all s∈S,f(f(f(s)))=s and f(s)−s is not divisible by 3. · Discussion

Discussing Let S={1,2,…,9}. Compute the number of functions f:S→S such that, for all s∈S,f(f(f(s)))=s and f(s)−s is not divisible by 3. · Omni-MATH

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