Respuesta :
The corect answer is 15.
This is a combination of 6 objects taken 4 at a time:
[tex]_6C_4=\frac{6!}{4!2!}=\frac{720}{48}=15[/tex]
This is a combination of 6 objects taken 4 at a time:
[tex]_6C_4=\frac{6!}{4!2!}=\frac{720}{48}=15[/tex]