combinations

[komark]

Can you tell me how [sub:3trvzj4y]n+r-1[/sub:3trvzj4y] C [sub:3trvzj4y]r-1[/sub:3trvzj4y] is related to [sub:3trvzj4y]n+r-1[/sub:3trvzj4y]C [sub:3trvzj4y]r[/sub:3trvzj4y]

 

[Deleted member 4993]

Can you tell me how [sub:1mertrxt]n+r-1[/sub:1mertrxt] C [sub:1mertrxt]r-1[/sub:1mertrxt] is related to [sub:1mertrxt]n+r-1[/sub:1mertrxt]C [sub:1mertrxt]r[/sub:1mertrxt]

How would you expand - in factorial form :

\(\displaystyle _nC_r\)