The number of people in the team is, 3
The number of players is, 7
Therefore, the number of teams can be calculated as,
[tex]C^{7_{}}_3[/tex]On solving, we get,
[tex]\begin{gathered} C^7_3=\frac{7!}{(7-3)!\times3!} \\ C^7_3=\frac{7\times6\times5\times4\times3\times2\times1}{1\times2\times3\times4\times1\times2\times3}=35 \end{gathered}[/tex]Thus, the number of teams is 35.