Please answer this ASAP

Here's the solution ~

The first term (a) of the sequence is 1

common difference (d) = -2 - (1) = -3

last term (l) is -236, so let's find the number of terms in the given progression ~

So, there are total of 80 terms in the sequence.

now, as we know ! in a Arithmetic progression the sum of all the terms is :

Now, let's use this formula ~

or we can use method ll where, the first and last terms are given ~

let's use similar procedure :

Now, let's find the sum ~

[ I'm taking first term as a1 ]

Let's use the formula ~

i dont know

step-by-step explanation:

345

step-by-step explanation: