How many Hamiltonian cycles are there in $K_{10,10}$?

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I want to calculate the number of Hamiltonian cycles in $K_{10,10}.$ Could anyone help me? I think in $K_{10}$ we have $9!$ Hamiltonian cycles.

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For all n≥3, the number of distinct Hamilton cycles in the complete graph Kn is (n−1)!/2.

So for K10, 9!/2

2
On

Are you asking about complete bipartite graphs? If yes, then please look here.