ONLY C please
for this question i am supposed to use the previous equation
i have tried subbing in 100 into n then subtract the answer i have from subbing in 1 or 2 but my answer wasnt even close
please help and explain thank you
Note, YEEEEEET.....we are summing 99 terms [ 100 - 2] + 1 = 99
So....
(1/6) (99) ( 2*(99)^2 + 9*(99) + 13) = 338,349
Check this against sum (r + 1)^2 from r = 1 to r = 99 = 338,349
ok thank you can u please explain where 100-2+1 come from please
100-2+1=99
+845 
