Examination

The class is 25 students. How many ways can choose 5 students to examination?

Correct answer:

x =  53130

Step-by-step explanation:

$$\begin{gathered} C_5(25)=\left({\displaystyle \genfrac{}{}{0px}{}{25}{5}}\right)={\displaystyle \frac{25!}{5!(25-5)!}}={\displaystyle \frac{25\cdot 24\cdot 23\cdot 22\cdot 21}{5\cdot 4\cdot 3\cdot 2\cdot 1}}=53130 \\ x=\left(\genfrac{}{}{0px}{}{25}{5}\right)=53130=53130 \end{gathered}$$

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