Sum

[Sailboat]

Would you be able to help me please with a problem I have?

I need to find binomial coeeficent I believe

? of k ([sup:v9m1moi7]80[/sup:v9m1moi7] [sub:v9m1moi7]k[/sub:v9m1moi7]) *([sup:v9m1moi7]k+1[/sup:v9m1moi7] [sub:v9m1moi7]31[/sub:v9m1moi7])

 

[Sailboat]

My appologies, below 80 is supposed to bek and above 31 is supposzed to be k+1.

 

[Sailboat]

What about this one?

?(k=100 to 201) ?(j=100 to k) (201 over k+1)(j over 100)

Sorr for the set up, it is tricky to type. The brackets indicated a combination.