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 ?

Question

anonymous · Answer

The formula for the 3rd term is:
$$a_0+2r=144$$

anonymous · Answer

what is the first letter ?

anonymous · Answer

The formula for the last term is:
$$a_0+nr=-27$$

anonymous · Answer

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

anonymous · Answer

I understand it now, thanks ^^

anonymous · Answer

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

anonymous · Answer

yeah

anonymous · Answer

alright, good luck.