Question

How do you evaluate 5C2 + 5C1?

Answer 1

`5C2+5C1=15`

Explanation:

`5C2+5C1=(5!)/((5-2)!2!)+(5!)/((5-1)!1!)`

`=(5*4*3!)/(3!2!)+(5*4!)/(4!1!)`

`=(5*4*cancel3!)/(cancel3!2!)+(5*cancel4!)/(cancel4!1!)`

`=(5*4)/(2!)+(5)/(1!)`

`=(5*4)/2+(5)/1`

`=10+5`

`15`

Have a nice day from the Philippines ....