Question

How do you do partial sum of an arithmetic series if the last term is not known?

Answer 1

you said that it's a PARTIAL sum, so , why do you need the last term?

Answer 2

What is Tn supposed to be in the equation?

Answer 3

it stands for the general form of the term in series

Answer 4

Like the difference of the terms?

Answer 5

for example, if your series is 1,2,3,4........
so T_1 = 1
T_2 =2.... and so on

Answer 6

using difference to find Tn

Answer 7

It just says "Find the 70th partial sum of the arithmetic series 37+49+61+..."

Answer 8

ok, post original one please, since you say so, the 70th partial sum is