# Math Help - Binomial series

1. ## Binomial series

Hi Fellas Im stuck on the following question can anyone help? Thanks
Evaluate ∑^n r=1 (9-3r)

∑_(r=1)^n▒〖(9-3r)〗

regards
John

2. Originally Posted by JCM133
Hi Fellas Im stuck on the following question can anyone help? Thanks
Evaluate ∑^n r=1 (9-3r)

∑_(r=1)^n▒〖(9-3r)〗

regards
John
$\sum^{n}_{r=1}9-3\sum^{n}_{r=1}r$

Recall the summation formulas.