Question

in an arithmetic series, the 3rd term is equal to 144 and the last term is equal to -27. the sum of all terms in the series is equal to 2325. what are the last three terms of the series ?

Answer 1

The formula for the 3rd term is:
\[a_0+2r=144\]

Answer 2

what is the first letter ?

Answer 3

The formula for the last term is:
\[a_0+nr=-27\]

Answer 4

the first letter is a small "A" with a zero subscript. It is the first term.

Answer 5

I understand it now, thanks ^^

Answer 6

No problem. But do you think you can solve this problem? Do you know the last formula missing?

Answer 7

yeah

Answer 8

alright, good luck.