Soccer teams

Have to organize soccer teams. There are 3 age groups. How many different ways can you organize teams of ten for each age group? Is this a permutation or combination?

Correct result:

x =  4060

Solution:

$$\begin{gathered} C_3(30)=\left({\displaystyle \genfrac{}{}{0px}{}{30}{3}}\right)={\displaystyle \frac{30!}{3!(30-3)!}}={\displaystyle \frac{30\cdot 29\cdot 28}{3\cdot 2\cdot 1}}=4060 \\ x=\left(\genfrac{}{}{0px}{}{3\cdot 10}{3}\right)=4060 \end{gathered}$$

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