A group of 18 people have gotten together to play baseball. They will divide themselves into two teams of 9 players each, with one team wearing green uniforms and the other wearing yellow uniforms. In how many ways can this be done?

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Here a group of 18 people have gotten together to play baseball. They divided them self into 2 teams of 9 players each. One team wearing green uniform and the other teams wearing yellow uniforms. We have to find in how many ways this can be done.