Answer:
491400
Explanation:
Given : A club has 28 members.
To Find : . How many ways are there to choose four members of the club to serve on an executive committee?
Solution:
We are supposed to choose four members of the club out of 28.
So, we will use combination
Formula :
![^nC_r=(n!)/(r!(n-r)!)](https://img.qammunity.org/2020/formulas/mathematics/middle-school/keq9fu1kexw4i9m71wsvnyit4wbq0pynjj.png)
n = 28
r = 4
Substitute the values :
![^(28)C_(4)=(28!)/(4!(28-4)!)](https://img.qammunity.org/2020/formulas/mathematics/college/ywm2oxsg0x10tuq66g4h4e1svkpbbclzlh.png)
![^(28)C_(4)=(28 * 27 * 26 * 25 * 24!)/(4!(24)!)](https://img.qammunity.org/2020/formulas/mathematics/college/51qcippggpaf4w58sswuqxb4e46upc9fng.png)
![^(28)C_(4)=(28 * 27 * 26 * 25 * 24)/(4 * 3 * 2 * 1)](https://img.qammunity.org/2020/formulas/mathematics/college/eipeutj34n6wuub5bwdzn7s0vjj3xmebix.png)
![^(28)C_(4)=491400](https://img.qammunity.org/2020/formulas/mathematics/college/jn3aa2hbiebrusgea7zeikscl97lzmxe3b.png)
Hence there are 491400 ways o choose four members of the club to serve on an executive committee